Which boomershooter (new or old) has the most accessible/easiest to pick up level editor?

I have some upcoming vacation time, and I'd like to create a level (nothing fancy, could even be a room with an enemy and pick-ups) just to say I've done it.

Which boomershooter (new or old/classic, e.g. Doom (1993) or Prodeus) has the easiest to use level editor? "Easiest" could mean fastest from design to deploy/play.

I'm a web developer by day, so I'm not too terrified of the command line or reading documentation, but as I'm on vacation, I don't want to go too far down a rabbit hole.