I have never glued the maps together, but I am a big fan of using long-standing pre-made maps that are ready for play. It really saves on time and can still allow for large size map variety if done right. At one point I had 22 pre-made mades. I decided to go back to my early collection (before the Marvel Set, Jungle Set, and D&D) days and try to make a leave-assembled-mega-map in my game room over the last year, but it doesn't allow for transport, and it isn't friendly for quick storage and it overwhelming.
Here are links to some of my uses of pre-made boards and then some mega maps.
http://www.heroscapers.com/community...highlight=maps
http://www.heroscapers.com/community...highlight=maps
http://www.heroscapers.com/community...highlight=maps
http://www.heroscapers.com/community...highlight=maps
http://www.heroscapers.com/community...highlight=maps