rgv,
For starters, the quote from Clint Smith, is a quote. It was meant to illustrate the point that a long gun is superior to a handgun. Nevertheless, any engagement that requires you to transition from your pistol/sidearm to your long gun would be considered "fighting your way to your long gun". The amount of movement required to complete such task is not what quantifies the statement.
Mr. Smith's quote is neither absurd nor out of place with respect to bear defence. Any engagement, encounter, or experience that requires the use of a firearm(and lethal force) to defend yourself will benefit from such words of wisdom. Man or beast, the faster one puts rounds and effective rounds on target the greater ones chances of winning the fight. Your adversary is irrelevent. A threat is a threat.
The use of a sidearm as a companion to your long arm is a very wise idea. I never stated you should opt for one or the other. Two guns is better than one. You are correct, the one that is always within arms reach will be the one that works. This is true of a long gun, provided you have th discipline to always carry it. Sometimes even with that discipline its not practical or feasable.
Any bush that is dense enough, wet/slippery or steep enough to cause problems with presenting your pistol or rifle is not somewhere that is going to offer you any real chance for survival. I find it hard to believe that such terrain is a common location for an encounter.
Buckshot is not an ideal load but 9-12 rounds of 9mm(balls) penetrating flesh simultaneously is not something to take lightly. Slugs being my personal choice offer twice the energy of a 44 mag round and create much larger holes. The largest hole with the most tissue damage(penetration) will be your most effective choice. 1600 fps(2.75 inch), .67 calibre and weighing in at 437 grains. Comared to 1250 fps, .44 calibre and 250 grains. I'll take the shotgun if I have the choice. Although I wouldn't feel bad with a 44 strapped to my hip.
Its good to hear that you've never been eaten(or nibbled). You seem to have found a setup that works for you. I'm not here to change your mind, it is your decision what you run. The decision to run a larger handgun shouldn't be done in hopes of shedding your long gun. Add more options for solving the problem, don't limit them.
TDC