Kelly
I have been staying at all of the value and mods with my DS4 since he was 5 weeks old - we live 1.5 hours away and go at least every other month if not more often. We don't feel that the price of the deluxes are worth it for what our child needs, or for his age - it isn't nice for the other guests to hear a baby screaming all night (which he sometimes did and we would get him outside quickly at the value resorts because they all open outside!) or for his interests. The values are what he requests every time we go. When he is older and can appreciate the deluxes more, we will go up to that class. I don't expect the bus service to be any different there, though, because I know at the swan and dolphin they have to pick up at 4 places each time so it is a longer trip, unlike POP with one stop. And unlss you are on the monorail line and going to the MK you still have to get on a bus with multiple stops. Yes, the walk to the bus stop is easier at the parks.
If you are worried about keeping your child occupied during the bus trip do remember to leave and arrive at non-busy times. If you have a really cranky child typically that isn't going to change on vacation, so work around her schedule and don't go commando syle touring because it will lead to massive frustration on the bus on the way back to the hotel. Because my Ds loves the bus, and says it is his favorite ride after the monorail we sometimes just ride around on buses to make him happy and we see the good kids, happy kids, sad kids, sleeping kids, and yes, screaming kids who are just too overwhelmed by all of the Disney Magic to cope with anything else. You sound like you are trying to plan for every eventuallity and that's great.
I agree that this is the place to ask questions, and I often do it myself, but I am so sick of people writing how nervous they are about Disney this or Disney that that I could scream, or vent, which in this case I did. I think that's allowed here, too.
Alicia