I use them in about half the fixtures in my house. Mainly in fixtures where the bulb itself will not be seen, or doesn't matter (like the basement work room or garage). Also, I use them in recessed fixtures with covers - these are a pain to change, so having a long lasting bulb in them is great. The cover hides the bulb, and tones down the stark bright white light given off. I also use them in reverse pendant style fixtures where the glass shade opens toward the ceiling.
Where I WON'T use them (admittedly, for purely vain reasons) - in my $300 dining room chandelier. It takes standard bulbs, but the glass shades face down. Stark white light on the table top, and ugly squiggly bulbs ruin the fixture completely. I also won't use them in certain lamps with "traditional" shades. Again, the light is too bright, and the bulb is ugly.
So - that's my $.02.
PS - I do care about the planet, but I really don't believe government regulation of household lightbulbs is the answer to the energy crisis.