Ya, you'll see a new experience bar under your profile. It isn't your XP 'till your next Mote of Light; it's actually your Light progress toward your next level--only increasing when higher ranks of Light-infused gear are equipped.
Well, I'm level 21, and matchmaking just made me play through the same two strikes 3 times each. I might be done grinding until the raids are out or they release new content. My Warlock armour is awesome, all black and silver, and no decent weapons are dropping past the endgame rifle. The loot lust is minimal.
I'm bored. The endgame is just replaying the stories/strikes with harder enemies.. So repetitive. Sure, I probably put in 20 hours since Tuesday but, man, I'm burnt out.