I've not stayed at CSR (so excited for November!!), but I have stayed at Pop, ASMo, ASMu, POR, and CBR - all with varying levels of bus service. We don't go back to the resort during the day. We do a lot of resort ADRs for meals and also hit DTD at least once per week of a trip. We tend to go open to close at the parks, give or take an hour or so at each end, so definitely traveling at peak-ish times. We do not park hop.
Certainly every resort has its tricks and tips on how to maximize it and these boards are a huge help with that. I have never had an issue making a ressie on time, though I do leave about 90 minutes for travel, and have often been rewarded by getting exploration time at a new resort.

Personally, I LOVE not driving again from when I park my car at the airport to when I get home. I come with the mindset that travel time is a necessity, and I feel anything less than 30 minutes start to finish is really good no matter where you're staying or going or from. Maybe that's because I grew up in the country or maybe I just like people driving me places!!
I would say that my biggest lessons or complaints are:
1. if you leave a park near closing time, the line for a bus is going to be long. This is the same phenomenon for leaving anything when it ends. Expect that you will have waits. Same thing for going for rope drop to anything about 2 hours after. If you can't or don't want to tolerate them, arrange for alternate travel.
2. Early ADRs at parks or resorts and also late ADRs at resorts can pose a problem. Since you have to route through a park with open or early hours to hub to your ressie, you don't always have a choice of what park is open and sometimes that choice is not the best for your travel plan. You again should consider your options for alternate travel.
3. Leaving and returning to a park takes much longer than you might first think. If you are planning on leaving each day for a nap or pool time, etc., make sure you budget an appropriate amount of time.
So my recommendation is this, given you have an average tolerance for bus wait times as a trade off for people driving you around all week -- if you review your schedule and find that you will often feel that you'll be calling a cab, add up those cab fares and compare that to a rental vehicle price for the length of your stay. My experience has been that I end up with 1-3 cabs per trip at most, which is about $50 total vs. a car for $300/week. It's definitely dependent on your travel style and plans!