If you know it is not going to be busy on the 5 (i.e. 3 day weekends like memorial day) I think you should be ok forgoing the tape. I had the same worries the 2 times I took the 5 instead of a rental. Other than the bugs, the rocks are usually caused by the cars or big rigs kicking them up in front of you. Try leaving early AM if possible - both times i left the bay area at round 1 or 2am and had the 5 to myself with minimal debris flying up at the car.
If you can't leave early and want more protection than the tape - try the 3M spray defender (clear bra like spray) or clear plasti dip. Both should get you more coverage and will peel off when your done.
Bring the radar detector
