Heh, and then one still accidentally writes !()[] or ()[]. The other nuisance for my users was that the [] text is optional (and relatively worthless from user

Heh, and then one still accidentally writes !()[] or ()[]. The other nuisance for my users was that the [] text is optional (and relatively worthless from user POV) in ![]() but not [](). I wonder if `!<url>` for images would've been nice alongside `<url>`. Reddit + the Reddit Enhancement Suite browse plugin have a decent middleground where all urls are autolinked but image urls have additional expand/collapse UI.