Here's how the current travelling between 'maps' works (maps being Cantha, Tyria and PvP isles)
You choose the port city to where you want to travel, then map. After that, you map to another destination.
If I'm in Market Place (Cantha) and want to get to Ascalon City (Tyria), that makes 2 loadings, which isnt efficient IMO.
What I'm suggesting is to make it so when you select a port city, then the map for that port city fades in or whatever, then you can select what outpost you'd like to travel to.
Exemple : You're in your Guild Hall, you want to travel to Henge of Denravi.
-Press M
-Click on the Boat, then select Lion's Arch (or it could be written "Continent of Tyria")
-Map of Battle Isles fades out
-Map of Continent of Tyria fades in
-You double click Henge of Denravi
-Voila
Would be much more efficient this way and we would save a load time (people with fast computers dont mind this, but people with lower end machines might end up saving 30+ seconds per travel.)
Hope I made this clear

Quite simple to implement and so much more efficient way of Travelling between continents.
Thanks!