Shutterbug55,
Not sure you can do this at work, but have you considered setting a timer for say 10-15 minutes? When it rings it will help you re-focus on the task you’re supposedly doing. Probably not a great idea in a meeting though:-) But perhaps a vibrating cell phone in your pocket can do the trick?
If there’s something really boring I’ll do that. It keeps me focused on completion since I’m kind of competitive and don’t want the timer to beat me 
No time for zoning that way! It depends on the task but my usual minimum time is 20 minutes. I figure you can almost do anything for 20 minutes. If I really feel un-motivated then I set it for 10 and that usually helps me get into doing the task. But in case I wander in my mind or otherwise -switching to unrelated tasks is a form of zoning out – then the timer ringing is a great way to bring me back on track.