I felt similarly about guys loafing a bit during games...then, I got some perspective on it and have since changed my mind.
A lot of the "lack of effort" comes from greenies no longer being allowed, and the banning of shit like steroids, HGH, testosterone replacement, etc.
Its a long season, with a lot of travel, with a lot of sleep deprivation. Some are worse than others, but everyone loafs a bit. Its a long season and everyone conserves where they can to go the distance. Couple it with half the league out of the running by the AS Break...you got a lot of dudes that just don't give a fuck to put in whatever effort you'd want them to.
The old timers bust the young guys chops, but they know why the young guys lack the effort they did...those dudes were drinking Greenies Gatorade all year. They were hopped up all year long and could go 1000mph. Players today just don't have that afforded to them.