My sense is that perl deployment is declining as it's replaced with better tools. What infrastructure is perl running?
I started playing with Ubuntu in 2006. Exploring the system, I'd come across system scripts in perl here and there, but Lennart Poettering has gradually displaced these with unit files that are much easier to read.
These days I may invoke perl occasionally. A few years back I used checkconfig.pl to build a slimmed-down kernel config for an embedded board. I expect it will eventually be phased out of these peripheral utilities.