I bet it was scary. The only time I stepped off a crane was during training, in the middle of the panavision grips department, on a custom built steadicam platform, fully harnessed up and assisted by some very good grips. At the time I felt entirely safe and loved the shot.
Having said that, without the harness I wouldn't have gone up (I'm a bit of a scardy-cat, I know, but people die making films every year).
The end of the crane wobbled a wee bit due to simple physics, add to that an unfavourable wind and I can easily foresee a situation where you I would be slightly unbalanced, or the rig would shift away from me, I would unseat a little and whoosh, the rig pulls me off a 30ft drop. Not pretty.
I remember at the time the grips said: Make sure you ONLY use a purpose built reinforced steadicam platform (not something they 'just knocked up') and ALWAYS wear a harness.
Colin Elves,
Steadicam newbie / doom-monger, london.