In the "text search" box of WikiTree+ key in creator_Gilchrist-1197 and replace Gilchrist-1197 (my user ID) with your user ID. You can find other "magic words" for various searches at https://www.wikitree.com/wiki/Help:WikiTree_Plus#Old_help
P.S. the initial search will be for only the first 500. Keep clicking the "extend search" link at the top of the page. Eventually WikiTree+ will find all the profiles and there will be a statement at the top of the page with the full number of profiles created by that user.
If there is an easier way, hopefully someone will tell us both.