Whenever you use Disney Busses, you can get dropped off
right in front of the entrance.
But, When you drive you have to park then take
shuttle then take Monorail and fight the crowd in all those situations.
I rather be dropped off at the entrance and not have to walk so much.
That's only true for MK. Though I don't agree about "fighting the crowds". We have to take the boat/monorail to the parking area.. then the tram to the car. We've never hit what would be considered a crowd, but maybe you've been there when it was more crowded than when we were there. MK is the only time it's a bit less convenient to drive and because of that we usually take the bus to MK if there are evening magic hours.
The other parks, the busses leave you to the sides of the entrance. Not a far walk, true, but when we park our car, we probably have about that same walk as you do, to the tram. And the tram DOES leave you off directly in front of the entrances for the other 3 parks. So we have about the same walk distance as people taking the bus.
And, if you use
AAA parking for AK or EPCOT... the walk is very short (maybe a bit longer than the bus people) to the front entrance. No need to use the tram.
If you're talking wallking... the busses don't save you much in that way at all.
They can be very convenient for some resorts. I found when staying at AKL it was really nice and quick to take the bus to AK. Very short ride! The bus was right around the corner of the entrance to AKL.. and the ride is about 5 minutes. Since AKL bus doesn't share resorts (cause it's a bit off of the beaten path), it's fast. I still liked to take the car to other parks though. It was faster.
We were at MK one day this summer and met a family of 6. They were staying at the Beach Club as we also were. We decided to leave the park and get together at SAB when we returned to the resort, so we left together, parting when they went towards the busses and we hopped the boat to the parking area (our chrysler pacifica only seated 6 total, so we couldn't give them a ride). We got to the resort 20 minutes before they did! The Beach Club only shares the bus with the Yacht Club (the Yacht Club drops off first) right next door.. but we were still back way before them. I thought they changed their minds about meeting us..lol.
So, I guess even MK, which I think is usually more convenient to take the bus... it still may be faster to take the boat/monorail to the tram to the car...
I think if you don't mind the busses (which might get crowded from what I hear.. standing room only).. and you don't want to leave property, you should save the car rental money and just take the busses.
But, if you don't like waiting for the busses... possibly having to stand on the bus, the time it takes the busses to stop at other parks/resorts, if you want to leave property for other things such as shopping.. Sea World.. IDrive, do a bit of searching and you can usually find pretty good deals on car rentals. My 21 day rental for the Chrysler Pacifica was only $493.
Cars will save quite a lot of time in the end and give you so much more freedom!