The quickfind list is the first plugin that I install on any site. I have never found the browse users interface particularly friendly and this plugin allows me to (extremely) quickly find any user on the site just by starting to type part of their name. You can also select in the settings which page it will link to when you click on the name.
I am currently using this on 2.9 without problem. It is an easy install and I tend to put it on the front page so that it will search the entire user database. You can also set it for teachers to use in their courses and it will only pull from their course but I primarily use it for admins that need to search for a student without knowing what course they might be enrolled in.
Big thumbs up for this one!