The Skyliner is fantastic and extremely efficient at moving people from point to point. Even when the queue is long, it moves extremely quickly and I never waited more than 5 minutes for the Skyliner during my recent 2 week stay at Pop, even at busy times (e.g. after park close at DHS when the queue was actually spilling out of the regular queue).
Another awesome thing about the Skyliner is that the stations at Epcot and DHS are built extremely close to the park entrances, and far closer than the bus stops (especially the Pop bus stop at Epcot which is just so ridiculously far away).
In my opinion the Skyliner is a complete game changer in terms of transport for Pop. It was amazing to know that I could go from my room at Pop to DHS in 10-15 minutes including walking and waiting time... especially since most of the time the waiting time is non-existent or minimal.
A couple of caveats about the Skyliner - it has shorter operating hours than the buses; it does have the occasional downtime (the Epcot line was down the last night and last morning of my recent stay), and it stops running completely in adverse weather.