We could argue what constitutes few vs. plenty of all day. This law is on the books, it's a felony and it has been enforced multiple times.
from:
http://www.utahconcealedcarry.com/viewtopic.php?f=11&t=10680
"The most interesting of the above cases to me is that of Cassandra Benally. Most of the others were clearly bad guys, and the GFSZA violation was just an add-on charge to put them away for a little longer (which I don't like, but bothers me less), but Benally was target shooting with her sister and a friend (Kelly), when Kelly said he needed to go pick his younger sister up from high school. When they got to the school, another person got upset at Kelly's presence and started making threats with an aluminum baseball bat. Kelly grabbed the gun for reasons that are disputed. Benally grabbed the gun to stop Kelly from using it, apparently not believing that the threats of the guy with the bat would justify deadly force, and to try to prevent the situation from turning deadly. Kelly and Benally struggled over the gun, which Kelly had cocked, and in the struggle the gun went off, shooting Kelly in the wrist. There was a lot of he-said/she-said over this sequence of events.
Anyway, the point is that Benally was clearly not intending to do anything wrong, and I suspect didn't realize that it was a federal crime to have the shotgun next to her in the car when they drove to the school. Then later when the fight appeared imminent, she was actually trying to remove the gun from the fight. Whether that was the right thing to do or not, it's pretty clear that her intentions were reasonably good throughout the sequence of events.
Not that I thought "good intentions" were necessarily a valid criminal defense, but this shows that at least one prosecutor is pretty aggressive about pressing this charge against ordinary people. The judge was at least a little lenient in his sentence -- two months jail (time served) plus a small fine and a couple years of "supervised release", which sounds like probation but with more oversight. But she still ended up with a federal felony conviction."