It will get easier now that you know the procedure. Believe it or not, it's easier than getting to the air filter on my ZR. On that bike, I had to remove the tank, the tank mounting bracket, and the battery to get at the airbox.
I checked mine this weekend (1,800 miles) and it only had a couple of buggies, too. Then again, the serious bug season is just starting here.
You may already know this but you can get the tank off by just loosening the fairings. The service manual would have you remove the whole thing just to get the tank off.
06 DL-650 - SilverBlue
05 DL-650 - red (RIP - watch your mirrors!)