One thing I find interesting about Neverwinter is that once you hit the level cap of sixty, your experience bar doesn't go away. You keep gaining experience as before, but instead of actually levelling up, you receive a "level-up reward" every time you fill the bar. This usually consists of some minor enchantments, similar to what you might find in some treasure chests, but you also have a chance of gaining an additional power point and therefore unlocking additional abilities. This doesn't actually make you more powerful, as the amount of abilities you can have on your bars at the same time remains the same, but it increases your options and saves you from having to reassign your power points if you want to try something new.
Personally I don't actually care that much about the extra power points, but I like this system nonetheless. Hitting max level in any MMO is an achievement, but if you actually enjoy levelling, it can also feel a little disappointing - a bit like hitting a wall. Retaining your experience bar softens this blow somewhat, and you can continue to enjoy that feeling of levelling up even as you start to dip your toes into endgame content. Of course the rewards lose their luster after a while, as they are really not that great, but by then you will hopefully have had enough time to get sufficiently engaged by the endgame instead.