Very true, Tackycomment. I have done the same - watched with great anticipation a "favourite" film from earlier times only to be a little disappointed.
That is not the case with The Wicker Man, though! I think I appreciate it more now, than when I first saw it. The subtleties are more apparent now.
As someone said earlier, Christopher Lee is excellent in the part of Lord Summerisle. I gather there is a sequel ( not a remake) being made (The Wicker Tree) and it will be interesting to see how that compares with the original