Freedom is the farming server, Virtue is the roleplaying server, Pinnacle is for drunks, and I'm not really sure about the rest.
Although they look like support classes, well built Defenders or Controllers can be destructive forces of nature.
Healing is nice, but City of Heroes/Villains is built on buffs and debuffs.
Pretty much invariably, you will enter what can only be considered endurance hell at around levels 8-10. Because the trial doesn't allow you to get to level 20, you won't see it get better. Believe me, though, it gets A LOT better.
It may or may not be a Nemesis plot. Nobody really knows anymore.