Same here. I keep a few guitars and a bass in E standard solely for the purpose of playing with others. I need to make more D standard friends.It's always standard for me: E, or D.
E for the guitars I use in the band I play in (not metal).
D for the music I make and record on my own (metal or metal related).
I may tune to Eb standard if I want to play something from Slayer, Alice in Chains, etc. But having the Helix's pitch shifting stuff available has made that unnecessary.