I haven't been to WDW in 3 years, but we stayed at POP last time and went to the Campfire singalong/movie night. We drove there from POP, so I won't be much help in letting you know how to get there, but previous poster is right. Make sure you allow plenty of time to get there.
And you asked if it is worth going to from POP - my answer is yes! It is free! My ex-DH and I went in 2003 and in 2005 and had a blast, even though we went without children (this was before DS was born). Chip & Dale make an appearance and it is just a really fun time.