The thing that sort of surprises me about some of those known long hitting touring pros or even real great amateurs like Sigel, well known for ultra length, is how much they might have in reserve if they ever feel the need for it!
I've always been interested in Love and have followed him closely his whole career but I remember one time in New Orleans quite a few years ago he needed a win to make the Masters and the New Orleans tourney was his last chance. He was near the lead and in the last round on the back nine it looked like he needed eagle on a real long par 5 to win. He had about 290 into a stiff breeze.
With those tour pros their swings are pretty darned grooved so it's hard to really notice any change of speed or power but Love took out his 3 wood and hit the ball so much harder than I'd ever seen from him. Into and through impact it was a blur. He knocked it on and close, made eagle, won the tourney and got into the Master. I'll never forget that one swing--it was like an overdrive I'd never seen from him before! Carrying a ball about 275-280 onto a green into a stiff breeze --imagine that!