Personally, I am for bigger maps. You can always add more eyecandy yourself, through FMB - especially now, when there is possibility to copy/paste hundreds of objects with one click, and computers are much more powerful than they were a few years ago.
To me, one of the biggest immersion killers is to climb up to 5000 meters and be able to see all four corners of the map, as if you were flying "over a game board on the coffee table", as Treetop64 put it very accurately
And Rabaul map... that would be something, a one like this perhaps:
