I have to agree with many of the comments in this thread. My friends and I are wasting way too much time per gaming session trying to get into the same instance (as we are in the same party), only to be separated again mid-map when exiting specific cutscenes or encounters. And for some of these instances we have not yet unlocked a way of entering through a blue-dotted zone border where an instance selection option is provided.

Groups should not be moved to separate instances. Failing that, groups should have a way of transferring to the same instance as the group leader. I realize instances are just a temporary solution that will eventually go away, and that feature support is as bare bones as possible for this mechanic, but these are features that should have been in place before instances were ever added. And since you're likely going to need to use instances again at some point in the future, why not flesh some of those features out now instead of later?