You're right about the buntline hitch. (One of the standard knots used, I believe, to tie a necktie.) I use it to tie my reef lines to the rings on the luff of my mainsail. I only have to remove them once a season, when I remove the sail for the winter, and it usually requires tools to undo the knot! But I do like the soft shackle. It makes removing the sheets easy, and the shackle does not get hung up on tacks.
On tacking in general, I make sure to let the genoa back the boat until the boom comes across, then blow the old sheet and pull in quickly on the new. This generally blows the genoa through the slot. In light winds, though, I end up having to go to the bow to walk the sail through about half the time.