Or you could just have signs that lead to the places instead of moving them
Most people dont really like random people just being warped to their builds.
Well I can see how world edit could have issues with really large builds.
But perhaps create a void world a pathway though the void if I may. and place those builds that are to big in their own floating island. with the signs going to the island and not the actual build.
Think the mighty quest for epic loot. Floating castles why not make floating builds. I've done similar things on my own server. the world edits can be taxing. but if there is no world to render, it's relatively cheap on the server.