We were there the last two weeks of August and didn't really have issues with the buses at SSR. The monitors were fairly accurate. I think there was one time where the bus (I think for MK) was delayed. Every couple of mins, the time on the board read a few mins later. Obviously, your waits have to do with when you get to the bus stop in relation to when the last bus left/ next bus will be arriving, but I'd say that generally we didn't end up waiting longer than maybe 10 mins for a bus (except that one MK one).
Now, waiting at the parks for a bus definitely took much longer, especially at park closing. After EMH at MK one night, we had to wait for the third bus to SSR and it took about an hour and a half. The wait for buses from DS to SSR also seemed to take forever. The boat was much quicker between DS and SSR, but it does stop running if the tides are high. We were in Grandstand so it was a short walk from our room to the boat dock. You could also hop on any bus and get off at the Springs/ main hub stop and walk to the boat dock.
Being the first stop at the resort, we never had to stand on the bus going to the parks. Occasionally people who got on at the Springs did. When coming home, lots of people had to stand. We lucked out a little with that one though, because we tended to be first in line for a bus/ waited for the next one when the bus was full on the way home and we never stood for that either.
The only complaints I really had about the buses were that they should really have more running back to the resort at the end of the night (but it seemed like every resort sort of had that issue), and the bus ride from DS to SSR seemed to take forever, especially given it's close proximity. Oh, and I would love if Disney would install a bathroom next to the bus stops, especially at the parks, but that's a completely different rant.