The map can be extremely confusing. There are no lines drawn defining zone ends (or a button to turn such lines on or off). When looking at a map, some areas that appear to have a path with waypoint leading to a new zone actually do not lead to new zones – usually just to a cave or champion. Then there is the issue within the cities. What exactly defines a Door? Or an Instance?
For example, the Charr city is ripe for this. The middle section has 4-5 instances yet there is no clear, obvious graphic explaining that it is interactive. No glitter, no moving parts, no nothing. In fact, the zone going into most of the (Home) instances usually look like a big wall. With nothing to tell you its a door. Have some sort of graphic explaining that it is a door please.