I'm luckier than most, my LHS is on my way home from work, and merely requires pulling over and parking. Or is that unlucky as it is easy to feed the addiction? Doesn't matter, I live in a small city and they are less then a ten minute drive away anyway. So if I don't stare at the shelves or talk too much, I can keep the trip to under a half hour.
I support my LHS (they know me by name, that's good, isn't it?) and yet I have also bought online. I recently received a package of models from Great Models which after shipping and duty still saved me about $50! Mind you each and every model was bought at half off the retail price. I would never pay full retail online.
My LHS knows I did this, and appreciate that I still managed to buy a couple of kits from them while waiting for the PO to deliver said package (there goes that $50 savings!). I also bought my AB from them and I buy all my paints and supplies from them. Since I'm in there once or twice a week buying something (bottle of paint or glue, a new detail brush, a book or magazine etc.) Jim is quite happy to share my business.
I get the best of both worlds. A decently stocked LHS where I can hang about and talk about the hobby, and a chance to save beaucoup bucks when Great Models has a big sale. Also my LHS can't afford to stock the plethora of PE and AM out there, so I get that online, too.
Support the LHS while you can, they are a dying breed!