My answer, based on personal experience **in the Sierra and Rockies** over 40 years, is **no, not at the level you describe**.  **Caveat** -- I don't have experience eating in a dining tent, or on a picnic table, or anyplace where many other people regularly eat. You may scrupulously clean up as you have described, but many others may not have and spills and food droppings add up.  (By the way, if the site has a picnic table, the area does not have "relatively low human pressure.")

Our experience is with back-country camping, at a campsite with no other people present, and  completely undeveloped campsites, nothing anyone looking for a place to camp would zero in on.     We cook near our tent and in bad enough weather right outside our tent door. We eat near our tent, and in bad weather, inside the tent.  After a few days, our clothes and hair undoubtedly smell of food.  I'd usually have a snack of gorp and M&Ms in my sleeping bag before going to sleep.  Before bear canisters became de rigeur, we hung our food and our garbage, our soap and our toothpaste.  Although several times in the early days, a bear came to our campsite, it was always because we had not properly stowed our food.  

With bear canisters, best to place them away from your sleeping place.  Bears know what they are and will make a stab at opening them, disturbing your sleep.  Bears also know what is in that bag hanging from a limb of a tree.    

You specified black bears. I have no experience with brown bears.