I am a Pentax user and I am looking at Nikon or canon for wildlife work. I have to say from using a 7D its has one of the worst control setups of any camera. If anyone has used a K7 or K5 you would be much happier you can think about taking good pics instead of fighting with the camera. Unless you need fast AF then pentax is behind in that.
I disagree, The 7D has fantastic ergonomics and handling. 
It is a free country, disagreement is your right :-)
After owning several Pentax dslrs I will admit their owners do become loyalists and the af is not that far behind ( actually kicks the 5d mkii in the teeth with af ). Now after using a 7D and owning the 5d mkii I can say in comparisons the Pentax k7 and k5 the ergonomics are more user friendly which probably helps their user satisfaction ratings and the system is rather tough with good enough affordable lenses for prosumer use. But the system is closed with no upgrade path beyond aps-c unless you jump to medium format, this is why I also own a 5D mkii and pray everyday for canon to buy out Pentax and learn something about designing camera control systems.
I know using a 7d and 5d3, when the 7d came out 3 years ago, that was it's trump card was it's superior ergonomics, especially compared to the 5d2. Now i've never shot with a pentax in the last decade, so i'm not as well versed, but do explain why and how the pentax has a better user interface... what quirks do you like? what dont you like? How are you "fighting" with the camera? do explain rather than make blanket statements for those who haven't used that camera.
Not a blanket statement, just an observation but I do not fight with my Canons. As far as user interface, Pentax has their control layout for most functions available at your finger tips and can be accessed with out moving your eye from the finder, switching af modes etc it is right by either your thumb or either forefinger. The control lay out is very nikon like but simplistic and less cluttered. Most Pentaxes are quite usable by anyone out of the box, even first DSLR users and not overly limiting to more advanced users and that is their appeal. After the ergonomics that is where they just fall behind, it is a closed ended system with no real pro level upgrade path and while the K-7's af is faster than the 5D mKII the SDM lenses are not up to par with the 70-200L F2.8 IS II (which I do own ) and only the Pentax limited lens series can match the L lenses for build quality. The system is limiting so I switched but that doesn't mean I can't miss using them and I still have my K20D which I do use regularly.
You have to think of it like this, Those Pentaxes are just plain enjoyable to use, but I needed to switch to the MKII to get better image results.