Coincidentally, I had this very conversation with my siblings (ages 70 and 72) over the weekend. They both got shingles, experienced excruciating pain for several weeks, and yet they both had shingles shots. Their doctors told them that if they hadn't had the shots it would have been worse. My father in law - a tough bastard if ever there was one - was kicked in the ass by his occasional bouts with shingles. He was immobilized with pain for days at a time.
Yes, if you even think you might have had chicken pox as a child, you must get a shingles shot.