Probably my most exciting hunt ever, was a big 9 point shot at about 15 yds with my blackpowder gun - The shot, the ball of smoke, blowing back in my face, the unexpected (and almost impossible bow shot - I might add) appearance of the buck, on opening day of our regular gun season, combined to make it an extremely rewarding, and memorable hunt.
Just because your gun might shoot over 100 yds, doesn't mean you have to! In the above hunt I described, I was hunting a heavy thicket, I supposed a smart deer might retreat to on the opening day of gun season. My longest shot possible was like maybe 25 yds. While I wasn't surprised it worked out that way, I would have been very hardpressed to get a bowshot at this deer. Instead of a story of the shot not taken, I have an incredibly good memory of one of the best bucks I've ever killed.
Don't let these guys disuade you from giving it a try, its not like you'll give up bowhunting, but it may add another dimension to your hunting experience.