By Europe I meant continental Europe, no the UK. The UK is heavily US influenced so there it's more popular.
And by devs I mean all SW devs, not just Web Devs who seem to heavily favor Macs.
Conferences are not relevant as they mostly draw huge enthusiasts/geeks of various niches who are very self conscious about their perceived status there(since you go there to network) and don't want to be judged by their high-value peers for using the wrong machine(yes, some developers can be very superficial and judgmental; we're not saints). It's like saying Everyone in my area owns fancy cars because every time I go to the regional car show I only see exotics.
Also, the Macs or no Macs is a very regional/company thing varying greatly between country/city/company.
For example, in Germany I never saw Macs at big industry giants, just Windows/Linux machines as the bean counters couldn't justify to management the extra cost when the same work could be done on a Lenovo with Ubuntu.
Anyway, Europe as a whole is by no means like the Bay Area in terms of Mac adoption.