Two highly influential muscians in my life were both pianists, Lester Henderson and my grandfather, T. Robert Bassett. Each said to me that they felt that the piano wasn't an instrument (unlike the violin for example), because you didn't have to have a sense of pitch and there wasn't much in the way of tone production, press a key and that's it.
In some ways I feel like that about the electric guitar. What once captivated me about the guitar as the height of instrumental expression now seems lacking. I'm not sure what it is, but in spite of all the effects and tone processing guitarists use, it just doesn't reach me like it used to. Oh well.