Just to chime in, as a blank fire reenactor who also does ww2 airsoft: the strides made in realism and atmosphere have been huge. People are there for the full experience, not just trigger time, and it really shows in the overall vibe of events.
I'm in FJR 5, a unit dedicated to representing the Fallschirmjäger, or German parachute troops. Here's a link to our "unit ethos" page that sums up what we're about in more detail:
We welcome anyone willing to work as a member of a strong team to create the most believable time travel sensation possible. It really is night and day different from regular airsoft. No one expects you to drop a pile of money on kit before you try it...just come out, we'll kit you up, and see how you like it.