Hurricanes George (1998), Irene (1999), etc. happened on us when we were living near FLL and working in Miami... but we were sort of in between boats then (original boat still in MD during George, still shopping during Irene, etc.) so didn't really have to do much boat prep. Learned all about hurricane shutters, though...
Hurricane Isabel, 2003: Our home dock was very wide -- we essentially docked our previous boat "sideways" across three slips meant for ~24' boats -- so we tied the boat in the center with ~12 or so very long lines, walked away, hoped for the best. That kept the boat from getting beat up on piles, and worked well for the ~8' storm surge. Several of the neighbor boats in slips but on lifts... floated off... didn't land nicely...
Hurricane Irene, 2011: Current boat, different home marina... we moved from our own marina to one with new floating docks. Tied up with about 16 lines, walked away (had to evacuate that area), hoped for the best, worked out OK.
TS Sandy, 2012: Current boat, prep during the period when Sandy was still a Hurricane and still aimed at us... we moved to a more sheltered marina with new floating docks. Ditto ~16 lines, ended up staying on board (no evacuation order there, Sandy downgraded to TS, and the track changed to further away from here), worked out OK.
For Isabel and Irene, we stripped the boat -- canvas down, etc. -- but for Sandy we didn't have to do all that.
-Chris