If I have too much to do, I find myself either stressed at having all this to do, or I find myself annoyed that I'm going to have to waste something.
If I have too little to do, then I can usually try and find atleast one thing to keep me occupied.
Unfortunately for me, I often either have nothing to do, or I'm focussed on one thing at a time.
And then the moment other things become available, suddenly I have absolutely loads drop on me at the same time.
For some reason all my friends seem to ask me to do stuff or to talk all at the same time.