I think it depends on your dining style.
I do not make a lot of ADR's. I usually make one for Le Cellier, because I love the sausage & polenta appetizer and it's a harder restaurant to get a walk in meal. Otherwise, I manage to get most of the restaurants I want either as a walk in or by visiting the dining website the night before. I do not like to plan my day around my meals. I prefer to eat if and when I get hungry - not because I'm on a dining schedule. I am perfectly OK with using QS as a backup plan if I can't get a table service meal. QS dining has improved as much as TS seems to have declined - there are a lot more QS options than burgers and hot dogs these days.
The only people I recommend should make ADR's are those using the dining plan (so they don't end up with credits they can't use), if you absolutely must dine TS every day, or if your favorite restaurant is a hard to get meal (like me and Le Cellier). If you are OK with dining at your second or even third choice of restaurant, dining at less popular times, or dining QS instead of TS, then it's not so crucial.