I just re-watched my speedruns for reference and it would appear I rarely shoot in the first place. The pen may be mightier than the sword but the buttstomp is mightier than the gun. When I do shoot, I shoot blaster, because I like when my ammo tanks stay full. If neither buttstomp nor blaster do the trick, the weapons that do tend to be seekers and pepper spray, the two most useful SP weapons. RF missiles in SP are a support weapon and shouldn't be aimed at anything but walls or blank space. TNT and freezer are hardly ever useful against actual enemies either. Bouncer and electroblaster have very limited use and are rarely worth the bother. Toaster is for those who can't aim.