Trackdays ruined street riding for me, and i've only done three.
+1 to LDH's futile comment. even some of my favorite local twisty roads (prior to track riding) are now just frustrating because you feel slow in comparison to what you know you can do. I'll still go out and thrash them occassionally but it's not nearly as satisfying as it used to be.
In a sense it's ruined sporty streetbikes for me. i'm looking forward to having some fun on this 88 hawk gt i got, the whole "slow bike fast thing".
On the street i'm finding it more satisfying if i have a smooth run through the twistys vs as fast as i can. that said, i still speed and still push it, but i'm definitely conflicted about it. i think my road riding will become more so about exploring and travelling or character once i have the space for a track bike, classic, and adventure or sport touring.
i don't really agree with people that make it seem like doing anything aggressive on the street is abhorrent, i still think you should be able to enjoy the bike/road, but not be pushing things to the edge.