I first started coarse fishing at the age of 7. I am now 37. I've tried most forms of coarse fishing, and am even reasonably competent in some of them

I started beach fishing when I was an undergraduate, and though I have never since lived so conveniently close to the sea, I still indulge when I get the chance. I took up fly fishing two or three years ago, for coarse fish at first. Last season was my first full season of fly fishing for trout. Since the start of 2010 I have been tying my own flies and fishing pretty much exclusively with my own produce. I have divided my fly fishing between fishing for rainbows in a large reservoir and a few small stillwaters and fishing for small wild brown trout in a tiny river.
A few observations:
Casting a fly line well is a new skill, and one I have not yet mastered. I'm getting better, though.
Trout are very stupid and very greedy, which makes it even more infuriating when they don't cooperate. Which often, they don't.
Fly tackle is perfectly adapted to fishing the dry fly. There is no other style of fishing, in my opinion, which can present a small floating bait better. For presenting a fly under the surface, fly tackle's presentation and bite indication seems terribly crude to me. Working round that is part of the challenge.
Not being able to feed the swim sometimes makes it feel a bit "chuck and chance it" compared to coarse fishing - though of course if you can't draw the fish to you or get them feeding on your hookbait, you have to go to them and figure out what they would like to eat.
Fly fishing seems to be more about the process and less about the ends than coarse fishing. Innovations which make it more effective tend to be frowned upon.
Some small stocked fisheries can sometimes feel a bit like catching small carp in a commercial.
Overall, I would say that it is neither harder nor easier, but different. I nearly took a fly rod with me on this evening's tench fishing trip, and then spent half the evening wishing I had done - lots of rudd rising in my swim would have been great fun. A waggler rod and maggot would have been far more effective, but that is not the rod I was pining for.