I felt that way about a year ago. Now, it's either below my level (vale, amrath, snooze) and the stuff is dead fast, or it's above my level (epic) and blade barrier is a waste of spell points for the damage it deals. Your point is a good one, especially when it comes to leveling up or soloing extensively on a non-melee build.
These and other game chances have changed the divine class metamagic calculus in my opinion. I have since dropped both extend and empower and focused much more on bringing melee to the 'excellent' level (and, of course, healing). The blade barrier is still sufficient when I need it to pull aggro, take care of weaker trash mobs, or simply do AoE damage, but if I had those feats, I wouldn't use them anymore except to extend spells.
I know people are very concerned with the mid levels, but we often get very stuck to our build decisions and fail to realize when the ship has sailed in endgame.