Filling the empty space doesn't seem bad at first. Except you miss out on time to just think. Time in the shower just standing there doing nothing but thinking in the water is some of my favorite time. Always needing to be consuming something that is short-term satisfying is likely to lead to difficulty having the patience for longer-term ideas/thoughts. Side effects can include increased general anxiety and missing out on conversations/connections with people around you among other things. Eventually, the habits can take up more than your empty/down time and start eating away at time you should/want to spend doing other things like playing with your kids, etc. It's a slow process that is hard to detect until you arrive at a place you're rather dissatisfied with. It happened to me.