Current setup is Windows 7 x64 with Strawberry 5.16.1.
I don't really use Perl all that much with my job. I have a few scripts that automated some daily tasks that I no longer do as my job role changed. I try to keep them up to date with new improvements for the few colleagues that still use my scripts.
I develop on Windows and started with ActiveState but moved to Strawberry 3-4 years ago. Current setup as above, but I also have 5.12.2 and 5.8.8 installed for testing mainly with Sockets (IPv6 support). I use Re: Multiple Strawberry Perl Versions under Windows to manage the different installations.
I learned Perl back in the late 1990's and have greatly increased my knowledge since joining this site back in 2009. Unfortunately, my coding style is still more 1990's and I don't really make use of many of the newer features - probably to my own detriment as I'm not really version dependent due to work.
Agree with Choroba - you should make this a poll question!