Unless you love grinding warzones or spaming for LFG (unles you have a pve guild) or just running circles in Ilum collecting boxes, you may want to stop as soon as you hit 50 and just roll another character.
Everyone knows the story is great and allot of fun 1-49, so take my tip and as soon as you hit 50start over, and do a new story.
Now i'm not saying the game sucks or is going to die or any of that dumb stuff, i'm just saying that the game is still young and it needs some time, so instead of hitting 50 at this time and getting bored, just work on all your charactors, build up your legacy.
Yeah WZ's are fun but having only three gets old pretty fast, ilum is fun when there is a battle, if you don't lag to the point where you can't move, flashpoints are great, if it's a hard mode and not bug out on you and if you are lucky to have a large guild and can get a group fast.
At the moment datacrons and gathering are the only reasons what so ever to ever visit another planet, at 50, most of you will be in ilum farming boxes waiting for a WZ to pop and even if your not farming boxes you will be there for the buff to get more commadations, only time you will leave is when your quest's are done and need to turn them in, don't even need to leave to buy the bags, just buy them in the warzone.
Oh, woops almost forgot raiding, well the normal 8 man raiding is a joke, hard modes bug out half the time and i can't say anything about 16 man raids, have not done any yet, but if you are doing those and they are working that is awsome.
Anyway, if you are an altholic like me then you will be fine for a few more months.