Plenty, actually.
Whether I'm at the university or working my second job, Lumia 520s and 635s are mf'ing EVERYWHERE. To a rarer extent I'll see 1020s, 920s, Icons, and 1520s too... and an increasing number of 640s.
At my primary job the IT leads all seem to have formed a 1520 guild, and two of the people I trained this quarter were packing WPs - one with a 520, the other which had an Icon with a cracked screen (who is apparently an avid user here!).
Obviously Android still has the largest mobile presence (with iPhone being an extremely distant second), but it's become lots easier to find other WP users in the wild compared to two years ago.