[whpalmer4]

Some thoughts:

It sounds like you have a Mac+OmniFocus in addition to the iPhone, right?

One approach would be to simply delete these routine "habit" tasks after completion. Make a perspective on the Mac that shows your completed tasks grouped by completion date, and every few days, just delete the "habit" tasks that you've completed. I assume you don't really need a permanent record of those actions. This will help keep the iPhone from slowing down, but doesn't address the cluttered forecast view.

Another tack is to combine those tasks into a daily routine checklist which you could keep in OmniFocus or some other application. OmniOutliner on the Mac works pretty well for this, if you can do all of your routine stuff near your Mac. Then you just have a single action which reminds you to run the daily routine checklist. If you get it all done, you mark it as complete, and tomorrow you'll use a fresh copy of the checklist. If for some reason you can't do it all in one block, add the ones you didn't accomplish to OmniFocus as non-repeating actions to remind you to finish them later. If you don't need to literally check them off as you run your checklist, you could keep the checklist in the notes of the OmniFocus action that reminds you to do your daily routine. By combining them in this fashion, you cut the clutter in your forecast view, but you lose the ability to have separate reminders for each item.