Who thinks you get used to music and who thinks it's an instaneous go or no-go?

Funny.

Some music I seem to totally and completely get immediately. 

Other things sometimes takes a while before I really feel and understand it, even if I can appreciate it to a degree on first listen.

Interestingly, neither case seems to imply I like something more over long periods of time.

For me, some are instant favorites and others take time.  In my youth, I was told that if I tried forms of music I truely and vividly hated, I would come to love them.

I tried.  I played everything.  In time, I came to accept that I like what I like and I don't like what I don't like.  If the circle of things I like is a tad smaller than the circle of things I don't like, that's okay.  Others look at my circles and comment that the stuff I like is microscopic in comparison to the stuff I don't like.  I ask them to stand in the big circle.

Society, you mean. 

Roight?

For me, if it doesn't hit me right from the start, it's not going to after time passes. If I hear a song in a movie that strikes me, I'll wait for the credits to find out who it is, and buy it on the spot.

Randy

Both for me. I've had albums that I really didn't care for at first that ended up being played constantly and also find that some tracks grab me from the get go and I never ever get tired of hearing them.

I also have a few albums that I used to play all the time that just don't appeal to me now, but I keep them as I figure that maybe one day I will play them again and remember why I used to like them so much. Strangely in at least one case it's the distinctive sound of the vocalist that just gets on my nerves now when it was that very thing that brought it to my attention and made me buy it in the first place. (MPeople -  Elegant Slumming in case you're wondering)

The very best stuff, the kind that holds up after repeated listens, always requires time to absorb and appreciate all the details. 

Ultra-simplistic music has its place, such as background for TV and movies. There, you have only seconds to grasp it so it has to be blunt. But like junk food, it's enjoyable for a moment but you wouldn't want to live on it.

Often, for me, the most enduring music has hidden depths and is not immediately compelling but ultimately gives a lifetime of pleasure. I have albums and CD's in my collection that I bought and only played once or twice, then revisited them years later and now will love them forever. As an example, I owned Kate Bush's double album 'Aerial' since it came out in 2005, played it once, never to be played again until the summer of 2011, last year. Immediately, second time around and 6 years later, I fell in love with it and it became the soundtrack to my late summer nights last year, and will do every year from now on. What changed in that time, well, for certain I did.

I think certain 'instant' music can still be classic music and not always junk food music. Punk rock did that for me, 'Anarchy in the UK' and particularly The Clash 'White Riot' have stood the test of time and introduced me to lifelong associations with these artists (PiL, Big Audio Dynamite, The Mescaleros)

So, to answer McQ's question - Works both ways for me...