Our experiences are opposite.
The monorail, like a bus, gets over crowded and full in the mornings and nights.
The monorail stops on the beam before each stop and "waits for clearance," just like a bus does at a stop light, when it is crowded (most MK days).
The monorail requires a transfer to get to Epcot, unlike direct bus service from your Resort.
The monorail can break down entirely for a night--or longer--unlike a bus fleet.
We find that it is BEST to try and eliminate as much Disney Transport as you can, and stay at a Deluxe Epcot Resort where walking is an option to 2 theme parks and 5 different Resorts.
Yes, I ride the busses and typically don't have a problem with them too often. But it seems like the monorail, although cool and neat and fun, is not as perfectly efficient as often expected to be. Yeah, I'll always ride monorails at least once per trip, but we find the convenience of an Epcot Deluxe Resort better than the convenience of a monorail Resort, having stayed in both areas several times. We actually prefer the water launches from Poly and Grand Flo over their monorail service.