I leave my pack under the vestibule. I tend to be very anal about food storage, toothbrush/paste storage, cooking, etc but I do not worry about the pack being next to my tent. If I spilled food or gas on it, I'd hang it but so far I have avoided that scenario. The only trouble that I have ever had with my pack was 32 years ago when I left it on the ground for a quick side excursion and a marmot chewed the heck out of the shoulder strap anchor to get some salt from body sweat. I think my experiences with bears not raiding my food are pretty typical.
FYI, I have camped in black bear country for nearly 40 years and in grizzly country for 25, both inside and outside of National Parks, in high use and low use areas. In the glory years, I averaged over 90 nights out/year.
As for canisters, it is required in Denali and other parks with few or no trees tall enough to sufficiently hang your food. Yeah, they add some weight but I did not think it was a big deal. In other areas with few places to hang, I was always able to find some cliffs or large boulders to hang the food from. I finally bought a canister last summer and will use it with the family on a tundra hike in a few weeks. Sure seems like a grizzly that is intent on breaking into could do so but fortunately most bears aren't wired or trained that way.
I have no idea why a park (e.g. Adirondack) in an eastern deciduous forest would require canisters except for the fact that a lot of people do not understand how to properly hang their food. Minimum of ten feet high, four feet from the bole of the tree and four feet from the branch it is hanging from.