I do watch my account totals more, but more from a standpoint of content/amusement... watching the daily swings amazes me on how 20 years ago I might have worries, but now they do not. Also, I'm fortunate to also have a pension, so that the amount I need for retirement from savings/investments isn't a huge amount.
Even with a 20% loss we should still be alright. At the bottom in 2008-2009 we were down close to 25%, since we have a 50/50 stock/bonds+cash split. I was more concerned about getting laid off, as Megacorp was shedding workers and making it to my retirement eligibility date meant an additional 12K-13K towards my yearly pension. I felt a lot better after that date passed.