I've played all the Disney courses, and while I don't think it's fair to say any of them are easier/harder than the others I think each offers different challanges depending on each golfers weaknesses. I'll do it in my order of preference.
1) Osprey Ridge, is by far the prettiest of the courses. It's fairly long, but you get good sized landing areas, quite a few carries over water. Tough course if your short off the tee.
2) Eagle Pines, most of the holes have a sort of scrub/bunker areas in front of the tees filled with pine needles ( which give it it's name) , these can mean a golfer often has to clear a good 120-150 yards before finding a fairway. As this stuff can be quite difficult to get out of, once you're in it, it's not likely to be enjoyed by a golfer who is very short, or has the habit of "topping" the ball off the tee. Once you clear the pine scrub you get some pretty generous landing areas. Enjoyable course if you hit the ball a long way but occassionally are a little inaccurrate as the wide landing areas are probably the most forgiving of Disney courses
3) (equal) Palm and Magnolia are both quite long, with a lot of carries over water, but fairly generous landing areas. IMHO a little tighter than OR or EP , but not hugely so.
5) LBV, has some great holes, including a "signature" island green par 3 by the entrance to OKW. It is shortest of the Disney courses, and is quite tight. Best choice for someone whose straight, but not too long. If you have a habit of spraying the ball around a bit , it may not be a course you enjoy as much as some of the others. My main "dislike" of the course is that you are very close to a lot of the buildings through OKW and my own preference is to be a little more "out in the woods" on a course.