To piggyback on McNulty's post, training camp and even the pre-season can be quite annoying because of the over analysis of every little thing. Quite frankly, what these guys do at quasi half speed against their own teammates is largely irrelevant. Film study, meetings, picking up the playbook, etc are the keys for the younger guys. For the veterans, get into football shape and stay healthy.
When it comes to pre-season games, young guys can get used to "game speed" and see what it's like to be "under the lights" so to speak. And for the veterans, it's all about getting through the pre-season healthy.
I honestly could care less about player X doing well in goal line drills or whatever. Honestly, I hold my breath until opening day, just hoping that no one key gets hurt.