The worst advice i see given is advice that tells people to get too conservative with your money. There is a temptation as people get close to retirement to invest too big a portion of their retirement portfolio in conservative funds. My advice is to keep what you expect to withdraw over the next ~ 7 years in lower risk assets (CD's, bonds, cash, etc.). The rest of the money should be invested no differently than if you were 25.....aggressive but smart investment in ETF's, mutual funds, S&P 500 index funds, etc. And then re-balance at the end of the year such that you always have the next 7 years fairly secured. But if you look at the history of the S&P 500 or the Dow, i don't think there's ever been a 7 year period at any point since the Great Depression where you'd have been better off in bonds than in the stock market.
And I agree that the bigger risk for anyone right now is inflation and not a stock market plunge. The Fed will print whatever it takes to keep it all afloat and "growing."