I used to like to print big. 16x20" was a kind of standard for shots I thought were good, and I would occasionally do multi-panel enlargements with four or six 16x20" sheets.

Now I rarely print larger than 11x14". I don't usually like to enlarge more than 4X from 4x5" and smaller if I can avoid it, and 8x10" and 11x14" negs I contact print.