UMMM there's a little line connecting comment threads instead of just indentations, so it is much easier to track who is talking to who in large, branching comment trees.

Collections are pretty neat for managing gift-art and collaborations, or stuff you've uploaded that someone else drew for you.

Tag your work! There's really nice filter stuff here at Weasyl. For artists who had to maintain multiple accounts at FA (such as keeping a separate account for stuff that might squick people out, or keeping a G rated/R rated account) Weasyl enables you to do all that with one account easily. If your folders and art are tagged properly, people can mark tags to filter out and they will become invisible in their submissions panel and on the user pages. No risk of seeing something you don't want to!

There's other useful stuff but that's it for me.

OH!

https://www.weasyl.com/journal/24548/fa-exodus-database-support-artists-petition-other-resources

Here's a list of some useful resources and links to other useful resources. There's a nice cross-posting tool too, so you can post here in one click from art you've posted to any of the other major sites.