it really annoys me when I get stuck somewhere and finish up totally wasting a few hours
I also hate that Val, and I am simply mad when I think of the amount of time I simply and stupidly wasted during my life! However, wasting time is one thing, and getting stuck is another thing, not so easy to avoid. Sometimes one can do absolutely nothing about it! For many sorts of creativity you must just be in the proper mood. Sometimes we have time but no inspiration... and we get stuk... and then we suddenly have inspiration, but no time! I am simply mad when I happen to be in a fantasy-writing mood while having hundreds of other things to do!
It was always a great consolation for me that JRRT had similar guilty feelings about wasting time and not finishing things... They are portrayed in a really poignant way in "The leaf by Niggle". And yet he offered us alll a wonderful Secondary World and influenced lives of millions of his readers!