You are a better person than I and very brave if I may add.

I can't take the heat or crowds during the summer months but everyone is different. heh.
This is a tough question. I'll answer in the way I feel is most helpfull.
It all depends on what kind of a traveller/vacationer you are.
Are you high strung and run a really tight schedule? Do you absolutely NEED to be at the restaraunt on time no matter what? If so, the busses will make you stress out. Rent a car.
Are you going with kids and plan to see a lot in one day? After a long day, do you mind waiting for a bus for 10 minutes with a kid alseep in your arms even though your feet are killing you from walking around the parks all day? (On one occasion, I had to stand on the bus in this very scenario and nobody offered me a seat!) If so, the busses will make you stress out. Rent a car.
Are you ok with your kids being a little out of control sometimes and aren't in much of a hurry? Take the bus. They are fantastic. (And most important, FREE!)
Are you trying to take in everything you can and simply enjoy your vacation? Take the bus. They are fantastic. (And most important, FREE!)
There are pros and cons for both. (Obviously!)
When we've had a car it is really nice to just get up and go wherever you want without waiting or worrying about a time limit. Makes planning your days a bit easier as they are more predictable.
However, the past few years, we've used buses and boats and they've been just fine for us. We've gotten used to how to handle or time and schedules to work around the bus schedules so it's no big deal.
Everyone's different. That's why there are options. You have to "honestly" examine your typical family and vacation lifestyle to make the best decision for you and your family's vacation.
I sure do hope that this helps.
Happy Friday Everyone! ! ! ! ! !
Fred