I stayed there last week for 9 days, and generally, the buses were good. I think we only had 2 times over the course of the week that we were really feeling less than happy, but that happens. The wait times were not excessive at all, probably the longest was 20 minutes.
Almost all the park days on the way to the parks, Jambo didn't share a bus, we had an empty bus coming. On the way back you have Kidani there too and it stops there first.
They do get a bit crowded, but compared to Saratoga, it was better.
The length of the bus ride isn't terrible, but a few of the rides we started feeling like it was taking forever. But it was really situational.
Having said that, I don't like the busing in general, we had
ECVs some of the time(my parents), my sit and stand stroller, backpack, camera bag, an 18 month old and a 6 year old. It is a process to get on the bus...