Here is a commentary by Dave Ramsey about Disability Insurance from his website: http://www.daveramsey.com/radio/highlights/?urlVars=2011/4/20/Why-Get-Disability-Insurance.
That was from April of 2011 and I did not find anything newer, so you may need to contact him directly to get a current opinion.
Yes, Dave Ramsey does recommend Disability Insurance. In fact he considers Long Term Disability Insurance a necessity for most full time workers. He recommends buying it through your work place if that is available. If not offered there, he says to try an association, and then buy privately if unable to get through an association. But buy it.
That was from April of 2011 and I did not find anything newer, so you may need to contact him directly to get a current opinion.