As the title suggest adding dungeon maps is rather undebatable. Having such a neat thing does not even distance us from blizzlike experience as dungeon maps were added in i believe Mist of Pandaria. I am not into scripting but i am sure it can be done as i already saw this feature on a private vanila server using oldest wow client 1.12. You could probably use existing MoP map files ,but one thing to bear in mind are the probable changes done to dungeon designs in MoP to vanila dungeons especially. Same thing can be done with Raid maps even though we know raids way to good to need a map i have in mind new players and people who clear old vanila/TBC raids they might find some raids confusing like AQ.