Funny that this thread is up this year, when Nadal's draws haven't been as easy as usual. He did actually get a difficult draw at both Roland Garros and Wimbledon, although he again got an easy draw at the US Open.
In the past, it was definitely the case that Nadal consistently got easy draws, and Federer and Djokovic got hard ones. For several years, they were the top three players in the world by a distance, so the only thing that really mattered from the point of view of the draw was which ones had to play each other in the semi-finals.
So, let's take a look:
Wimbledon 2012 - Djokovic v Federer; A. N. Other v Nadal
Roland Garros 2012 - Djokovic v Federer; A. N. Other v Nadal
Australian Open 2012 - Djokovic v A. N. Other; Federer v Nadal
US Open 2011 - Djokovic v Federer; A. N. Other v Nadal
Wimbledon 2011 - Nadal v A. N. Other; Federer v Djokovic
Roland Garros 2011 - Nadal v A. N. Other; Federer v Djokovic
Australian Open 2011 - Nadal v A. N. Other; Djokovic v Federer
US Open 2010 - Nadal v A. N. Other; Djokovic v Federer
Wimbledon 2010 - Federer v Djokovic; A. N. Other v Nadal
Roland Garros 2010 - Federer v A. N. Other; Djokovic v Nadal
Australian Open 2010 - Federer v Djokovic; A. N. Other v Nadal
US Open 2009 - Federer v Djokovic; Nadal v A. N. Other
Wimbledon 2009 - Nadal v A. N. Other; Djokovic v Federer
Roland Garros 2009 - Nadal v A. N. Other; Djokovic v Federer
Australian Open 2009 - Nadal v A. N. Other; Djokovic v Federer
US Open 2008 - Nadal v A. N. Other; Djokovic v Federer
Wimbledon 2008 - Federer v Djokovic; A. N. Other v Nadal
Roland Garros 2008 - Federer v A. N. Other; Djokovic v Nadal
Australian Open 2008 - Federer v Djokovic; A. N. Other v Nadal
In other words, in a 19-Slam stretch during which they were the top three players almost always (at the US Open 2009, Murray was seeded #2), Nadal only had to play one of the others in the semi-finals on three occasions, while Djokovic and Federer were drawn against each other on 16 occasions.
Conclusion: Nadal has historically had a ridiculous number of easy draws in major championships.