Yes I do think The Exorcist is the greatest horror film of all time. I seem to remember we discussed this subject before? Or perhaps I'm misremembering. Anyway, it is brilliantly acted, scripted, and directed; an iconic classic with a deserved place in popular culture, and - most importantly - genuinely scary. I also have many personal reasons for feeling this way. But each to their own, obviously. The films you mention are also terrific. :)