I understand where you're coming from, however I have a chronic illness that significantly limits the amount and type of activities I can engage in. I used to love learning languages and teaching others, but I no longer have the energy or mental ability to do that. There is almost nothing particularly productive I can do, so I'm having to learn that I need to simply take care of myself and do what I can. One of the recommendations for people with my condition is to engage in pleasant activities in order to reduce stress and have better coping, so that's what I'm trying to do. So far watching movies is one of the few things I've found that I am able to do. So while it may be a 'waste of time' for some, it's been a blessing for me.
I'm hoping I can find other things I can do as well, because I do get tired of watching movies. For example, I thought of horseback riding, which I might like to try. It's not too physically strenuous, but at the same time it does build core muscle, so that might be good for me. And I hear there are therapeutic benefits to horse riding as well.