Travel time is a bear. Here's one thing I do.

I split my 5-box team up with their Hearthstones. I put two near one dungeon area and two near another. Then I just use summoning stones to port myself around. Since I have 2 multibox teams, I do the same with the others and am generally able to summon myself to a nearby instances very quickly.

Shamans or Druids (or others) that can teleport to a sell location are always handy as well... I load up my druid with grey junk then Moonglade port to sell every 2-3 runs as needed.