How many days listening is 1200 tracks?
I don't think anyone ever gets all the way through a playlist that large.
My player gets used constantly, and I rarely get more than a couple hundred tunes into a large shuffle before I've re-shuffled or selected another playlist for some other reason.
For instance, I just got back from a weekend trip with my wife. When she's around, the player gets dropped into its "low key" playlist and stays there. That's currently a list of about 250 songs.
We had the player going for the entire 2.5-hour trip to Napa, we had it hooked up in the hotel room playing about an hour or two each day, it played for about an hour as we drove around Napa, and we had it playing for the entire drive back.
It only got about 2/3 of the way through this relatively small playlist by the time I got home and put it back into a full-player-shuffle.