I think it was Mark Twain who said something to the effect that the surest way to get someone to hate an activity they used to love is to pay them to do it.
I don't really agree with that, though.
I've had jobs where I woke up in the morning and said to myself, "Wow! I can't believe I'm paid to do this!"
And I've had jobs where I watched the clock all day and couldn't wait for it to be over. (The last one of these was over 20 years ago, thank God!)
Most of my career has involved getting paid for creativity, and, most of the time, I've been pretty happy with it.
I guess it's just nice to have a change of pace every once in a while. Do something in a new medium, or learn something new. Or maybe just take a vacation. :-)