My personal feeling is the FT and PS freerolls and other multi-thousand player freerolls with low payouts are not worth the time.
1. With the thousands of players, they take hours to play.
2. They are donkfest. Your premium
hands will be called/raised with trash repeatedly. Although you may be a favorite in each of these hands, eventually someone will suck out on you. Might as well play the lottery.
3. Since they are donkfests, I don't think you really learn much.
Bottom line, avoid them....perhaps unless you are playing other tourneys and can spend a minimum of attention on the freerolls while otherwise engaged in meaningful play.
CC freerolls and others with limited entries are another matter. They are well worth it.