We have taken our four kids to WDW each year for the past 5 years. Our youngest two are now 6 & 4. Each trip I had my citi mini double stroller with us. We have stayed at SSR, BLT several times, and OKW. This years trip is at VWL. We find that when most of your time is going to be spent at MK, then it is best to do BLT.
the monorail, and the ability to walk to the park are perfect. I actually like the walk better because it can sometimes be quicker than the monorail. It also makes it so convenient to just leave the park to take a nap, then head back over later. SSR buses are super crowded, and it can take 20min just to get out of the resort. OKW was a great resort. We did split stay with BLT last year. Buses run often, and are never crowded. The rooms are huge, plenty of space for little ones to play. We asked for a ground level room near the bus stop. That worked out great because we just rolled our double stroller into the room, and left it by the door. Yes, the room is that big if you get a one bedroom.
This year we are staying at VWL. it's a short trip because we are cruising also. We didn't have the points for BLT again, and I would like a change of scene. Still we needed quick easy stroller access to MK, where most of our time will be spent. IMHO, VWL is second best for MK visits to BLT.
The biggest problem with the buses is not the wait. It is having to take two sleeping kids out of the stroller, folding the stroller, and carrying it on board the bus. Not easy with just two adults.