Ferrer only plays as much as he does, because it's the only way he can sustain his ranking. Does that deserve recognition? Sure, hard work always does. But why would the Big 4 risk being burned out by Wimbledon just to prove a point? They are trying to maximize their potential of going deep in slams or well, win them. A prospect that Ferrer (and most of those ranked below him) probably knows, isn't very realistic for him at this point.
He'd be able to sustain his ranking now without playing so much - a lot of the smaller events he plays aren't counted in his ranking total. He could definitely cut down on the number of 250s he plays. The problem for him is that he hasn't adjusted his schedule from the days when he wasn't a top 8 player and didn't do as well in the masters and slams. I don't get Bodo's point though as Ferrer's looked very tired from all the tennis he's played, hasn't played particularly well and is now injured.
Andy's scheduled very sensibly this year. There's no danger of him feeling burnt out in the stretch of the season that matters to him the most (Wimbledon-US Open), and he's also improved his performance in the Masters series so far from last year.