Work is the "2nd space" in the Starbuck's "3rd space" advertisements.
Have you tried working in the same seat at a library or other public place each weekday?
Some of my friends freak out at the possibility of 'wasting even more time' by trying to track time. I disagree. Tracking is light (0.5%?) and clears mind from all unnecessary underground thinking and stress resulting from not knowing the numbers.
The idea is to keep it simple. I track in one place and I (mostly) track projects only (billable and non-billable) plus some phone calls (with comments). Tried to track HN related browsing but... it was... never mind.
Did you added some code to the spreadsheet to make it easier to use? Any graphs to _see_ it?
I'd say it's probably useful to measure, but also key to keep in mind when you're warming a seat just to move that number up, rather than actually getting things done.
Including other measures of work output would be a very good modification.