Anyone quantify how far off their training plan they are time-wise?

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If you are following a plan, the only reason you would be "off" in your numbers is if you missed the workout or short changed it???  You can always look at your logs (or spreadsheet) and see if you missed days I guess.

But I use the BT logs, so can always compare.

Not really, I tend to look more at total load. I use a few softwares for myself and my atletes (Training Peaks and RaceDay) to quantify total workload (volume/duration + intensity) and based on that I can see how consistent my workload is week after week. Sometimes I train more hrs yet my total load is around the same as some weeks I've trained less because my intensity was harder.

You can use volume (hours/miles) to have an idea how close or not you are from your plan/goals, IOW how much work you have done, however you should consider intensity as well to get a better idea how much work rate is that you have accomplish week in week out. Remember is not the same doing 10 hrs of easy training than doing the same 10 hrs of moderate/hard training. The latter will produce greater fitness gains and chronic fatigue in general.

I don't generally short change workouts but I have had to take days off here or there for work/life. I don't skip key workouts without making them up but sometimes the shorter one's happen.

I saw quickly the other thread about "measuring" intensity. Do you generally do this by HR?

I just did this tonight just to see how my time was looking against the plan.  I use the BT logs and just made a graph of planned vs. actual.  I am also under, but I knew going into the plan that I would most likely run under due to life.  I was also interested because after my race I would like to give a report on the plan, based on how I used it.