I've stayed at Jambo twice and at Kidani three times. Never found the buses to be an issue. Yes, it does take a bit longer to get to most of the parks, but these resorts are the furthest removed from all by AK...so no surprise there.
Only one time did I have an issue. It took forever for the DHS bus to arrive. We had been waiting for about 30+ mins..had arrived just as the DHS bus was pulling away. And then? When the bus finally came, my friend and I moved to the loading area, only to have someone say 'Hey, they're cutting the line, we've been waiting here 45 mins!! We should be boarding first!!' Really? If they had been there 45 mins ago, they would have been on the bus that was leaving as we walked up, not to mention the fact that they were nowhere to be seen when my friend and I got there...and then stood beside the loading area!! But, other than the late arriving bus, I can hardly blame Disney for that experience!!
The buses at AKL/Kidani are not better, no worse than any other resort. And I've stayed at most of 'em.