Main reason world edit is used is for large editings or pastings. Having world edit in the normal creative world WILL lag the server. If anything, if the project you need done is simply just too large, hire an arch instead that's why we're here.
Side note - World edit is very useful and...
a: You make cures and supplies to sell to players or to the NPCs at /warp hospital
b: I think you can heal them by right clicking the item while looking at the player, but if that doesn't work you will just have to give the item to them to use.
Update 5 (September 8-10) - https://imgur.com/a/eRl8s
Here you can see, we have been making good progress along the side cliff walls. Special thanks to QueenMelone for helping out with the castle! It currently looks really good!
I think it's too large for undeadland, paradise, and probably eisland lol.
As for @Gabriel , my offer is still open if you, Leanne, and Death want a custom park built (custom dimension I mean).