Deleted Instagram yesterday and Facebook has been gone for months. It took a bit of time to adjust (literally found myself opening my phone and swiping on the Home Screen pages mindlessly then locking it again.. scary how addicted you can get to your phone).
Sounds like when I quit smoking, even after the addiction went, the habit a muscle memory stayed around for a while. Took ages for me to stop checking my pockets for a lighter when leaving the house, before remembering I don’t smoke anymore...