Sometimes it takes me quite a long time to figure out what I want to play. With a 200 game steam library, 20 some games in origin, and another 30 not on either platform (like blizzard games), I am sometimes overwhelmed by the amount of choices I have.
The bad habit is how indecisive I am about it. Sometimes I am just browsing forums for 30 minutes to an hour before I even start gaming because I can't make up my mind. Right now, not a huge problem... thanks divinity original sin.
But most of the time I am thinking about hearthstone, firefall, titanfall, a single player fps, or another one of my steam games. Another thing that factors in is whether I can play it in windowed mode so I can watch netflix at the same time... xcom, civ5, dead island epidemic, hearthstone, and several others work really great for this.