I don't use it much at all. If it is used it is used to cover food during cooking, nothing more.
If I have left overs and they need covering and refrigeration, then they go into a bowl and will have clingfilm over the top of the bowl, not touching the food. If it does not require refrigeration, then it stays in the pan it was cooked in on the stove.
Anything like daily sandwiches are not wrapped in foil, it is not environmentally friendly to do so, irrespective of any health concerns, a dedicated sandwich container is the better (and cheaper) option.
Anything that needs to be frozen goes into a bag or box with its name and date one. Never tin foil.