First, it's a tentative agreement that will probably be voted in. Delta pilots have NEVER rejected a TA. Check back the first week in July after the vote count. My guess is 60% in favor.
Second, Delta has no pilots currently on furlough.
Third, yes, they went through bankruptcy and terminated their pilot pension plans. Still a lot of bitter feelings (rightfully so) from those affected.
Fourth, if your from the US, a legacy carrier job is still the the best thing going IMHO. Just plan on taking care of your own retirement.