I never really liked the Christopher Reeve "bumbling Clark Kent". Honestly that's really the only place that Clark was that clumsy and bumbling. Dude could barely walk a straight line without tripping. Even in the late 70s/80s Clark wasn't that goofy. Superman was more goofy than Clark. Clark was pretty cool - to an extent. And especially after the Byrne revamp he went from the geek to well... less geeky.
I think the reason I really like the bumbling movie Clark Kent is because of the pure charm Reeve had in the role. He was so good there, that I think if it hadn't come across so well, it could easily have been a total disaster. But he makes it work. I do prefer the more serious takes on the character available, but I just love that movie - it's just such a fun, pure fantasy all around.