Skills are improved by experience and the repeated practice of techniques (assuming proper form is maintained).  Skill development is the most important thing in improving individual and team performance and is the focus of every practice and every drill.

Any strategic planning is taken care of off the field.  On the field it almost all skill refinement and improvement.  Here is a outline for just about any succesful practice:

1) Warm ups and streatch (for safety reasons)

2) The majority of practice is spent doing drills and games that are designed to improve the players skills.

3) The last part is some type of scrimmage.  The scrimmage is once again to improve their skills and give them more experience and repitition.

Not time in practice is spent "worrying about team and strategy". 

" I don't want to be standing around teaching kids how to shoot a jumper or whatever."

1)  Take it from a basketball coach.  You will always be working on your players' jump shots, no matter what their skill level is.    You will always be working on improving your players' dribbling and passing abilities. You will always be working with them on defense and footwork.  That is what practice is.

2)  You won't be "standing arround" in practice either.  Corrections on form can be done by working one on one for a few minutes with the individual while rest of his group continues with the drill or game.  Often times, all that is needed is a reminder(s).  Changing how one shoots is a matter of muscle memory.  If one has developed bad shooting habits, those take time an repetition to overcome.

"but I certainly appreciated the kids that made strides during the off season."

Practice outside of team practice is important for skill development (in most sports) However, the best skill development comes from the kids practiceing at home or with friends.

A sports camp tends to provide repitition and experience comparable to 1.5 to 2  weeks worth of practices.  While that is useful, 2 weeks of additional practice time is not going to make a big improvement.  Having a player spend 30 min a day over the Summer working on the dribbling drills I give him, will have a much bigger impact.

Here are the benefits of BYU Sport camps:

1)  1.5 - 2 weeks of practice experience.  Better than nothing, but in and of itself, will not make a significant difference 

  in player ability.

2)  Practice with different coaches who may have different views, drills, and techniques to share.  This is probably more important.  They could be introduced to a new move or a new drill  that is more effective with them than the ones they currently know.  If the players keep working on those new moves/techniques at home and in team practice they can develop into additional skills.

3)  A fun sporting experience. When I attended, my skills did not noticable improve during the camp, but my appreciation and enjoyment of the sport did.  That is important to keep players ingaged when things get hard during practice and games.

4) Most importantly, a great BYU experience.  Per my original post I had a great time. While I was already planning on attending BYU, I desire to attend definately grew as a result of Sports Camp.