Mid-day breaks have been a godsend for me. I admit to being initially hesitant to give up that time, but after doing it for the last 10 years since I had kids, I might even keep taking the breaks once my kids are grown.
I usually eat lunch at the park and then head back at 12:30 or so and aim to be back in the parks by 4. The time we miss, will be the most crowded and highest waits of the day, and both parents and kids are refreshed. The few times I have gone without a break, the kids get very cranky by dinner time and we usually end up leaving early and sacrificing the cooler, more relaxing night time touring which is far more productive and fun than the stressful midafternoon hours.
As for the busses, the mid-day bus ride is one of my happiest times in WDW. The busses are usually quick, and you’ll often be alone. My kids love having the bus to themselves. A relaxing ride back to the hotel after the hectic hustle of a theme park is a nice way to exhale and keep your sanity.
The way I see it, you are giving up quantity for quality. You may not spend as much time in the parks, but the time you do spend there will be more enjoyable.