i used the VIP service to take my elderly mom and sister to WDW.
i didn't think we'd make it for the full day, but we actually did a full 12 hours with him..
was it worth it? probably in that situation yes, as i don't think i could have taken them through disney any other way..
did i personally enjoy it? not really, as i much prefer a slow, meandering sort of approach to WDW....plus i'd always rather be with DH, DD and DS than anyone else (they weren't with me on that trip).
would i do it again? if i had money to burn, probably...but only if DH, DD and DS wanted to...
i know people who only do disney that way...they go several times a year for 2 or 3 days each time, using VIP each day...so clearly for them it's worth the money..