The Simple Tools in the TravelTime add-in take the underlying functionality of the three Quick Tools and enhance them with more configurability.
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Not only do they allow more parameters to be selected, but they run off a point layer as the input, rather than a map click or an address / lat-long which is entered manually for the Quick Tools.
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The three Simple Tools are:
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1. Time Map Simple - used for creating isochrones or 'reachable areas'

2. Time Filter Simple - used for creating travel time matrices

3. Route Simple - used for creating A to B routes with turn-by-turn directions

The Simple Tools can be accessed through the Catalog Pane, under TravelTime_Platform >> Simplified

If this is your first time using the tool, the TravelTime toolbox will first need to be enabled in the Catalog Pane by clicking the Show the Toolbox from the TravelTime tab in the top navigation:

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The Time Map Simple tool can be used to create isochrones around a layer of points, for any method of transport including public transport, driving, cycling, and walking.
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In the example below we have a point layer of 20 real estate locations in northern California that we are considering investing in. As part of the analysis we need to calculate the driving areas around each site.
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To calculate a 45 minute driving area around each store we configure the Time Map Simple tool as follows, with the North-California-Sites layer as the Input:

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The Time Filter Simple tool can be used for two pieces of analysis:
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In the following example we have two separate point layers loaded into ArcGIS Pro. The first layer is simply the location of our office in Upper East Side, New York. The second is 585 zip codes in the surrounding Manhattan area and beyond.
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We want to work out which of the zip codes are within a 1 hour travel time by public transit to the office, to arrive at midday on a weekday. We configure the tool as below:
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The result is a visual representation of the reachable and unreachable zip codes:
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By opening up the Attribute Table of the output layer we can also view the travel times (in seconds) from each Departure Location ID to the office.
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For any travel times greater than the 60 minute cut-off we set, no travel time is returned. If we wanted more of the travel times to be returned, we can set the travel time to the maximum value of 240 minutes (4 hours) which will then return any values within a 4 hour limit.
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The Route Simple tool can be used to perform two functions:
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In the example below we have two layers of points, one showing the location of our office in Johannesburg, and another showing where some of our local client sites are. We want to calculate the routes from the office to each customer site by public transport and by driving, to arrive at midday local time. We run the tool twice, once with each of the different Travel Modes:
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The resulting output is two new layers, one for each transport type. Because we selected the By travel time option as the Output style, the routes are grouped into buckets of travel time.
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​Public transport routes:

​Driving routes:
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Notice that some of the client sites are not reachable by public transport given the parameters we selected. To learn how to configure the more advanced parameters to capture more public transport routes, visit the ArcGIS Advanced Parameters tutorial.