If you go to a tournament, the players look huge from a distance. Because everything about them is so familiar, your eyes just gravitate to them. But when you get up next to them they are tiny. (DISCLAIMER: I am 6'6, 220 lbs. That's 2 meters, 100 kgs).
It's also very weird to see players going through regular motions. Even though we know they are real people, because 99% of what we see a pro golfer doing is playing golf or giving interviews, it makes it very difficult to picture them doing regular things. I was at an event and saw Couples and Els eating sandwiches. It looked really bizarre. At some level I've just become acclimated to the idea that pro golfers are really midget robots who live in my television and play golf at certain times of day.
I've only seen Tiger play once in person, at the 1995 NCAA Championships at the Scarlet course at OSU. He hit a lot of great shots, but also some really wild ones. On #2 he hit a more violent duck hook than anything I've ever hit myself. He's not hitting too many of those anymore.