Sorry, missed this before- yes, I depended on the WDW transport for everything!! The buses were surprisingly frequent (every 15-20 mins or so during the day (as advertised)) but they seemed to struggle on a night for some reason on a couple of occasions (just a couple mind!) Oddly Epcot saw the longest wait times (despite being only 5-6 minutes away) at closing; im guessing but maybe with the proximity 'they' relied on less buses doing more runs. DS, AK and MK buses were very good at closing aside from one night (the 17th i.e. Disneylands birthday) when what seemed like the whole of POP century was in line (the line stretretched back to the MK dock from what I could see) but they sent extra buses eventually.
Aside from that freakish mass exodus from POP inhabitants, the transport was excellent.