Darn, wildwilliam, you stole my thunder!
Like you, I like to stir the paint rather than shake it because my experience with shaking the paint goes like this: No matter how tight I put the top on, a tiny bit of paint seeps between the lid and the mouth of the bottle. So I use the paint, put the lid back on, put the bottle away, and the next time I'm ready to use that color, lo and behold, the lid is stuck to the bottle!
That means I have to get the pliers, which are buried somewhere in the box of carpentry tools at the other end of the living room, buried under hiking books and the paper plates. (Why do I keep the paper plates on top of the toolbox? Trust me, you don't want to know.
) So I have to walk across the living room, remove the paper plates and hiking books from the toolbox and then remove the lid from the toolbox. Somewhere amongst the duct tape, dovetail saw, jars of nails and screws, cans of stain and paint, hammer, screwdrivers, sandpaper and a host of other items is the pair of pliers. So I have to paw through all this stuff, playing a dangerous game called Toolbox Roulette. The object is to lay your hands on the desired tool before the dovetail saw slices your finger off.
Rather than go through all that, I find that stirring the paint greatly reduces "stuck lid syndrome" almost to the point of non-existence.
That's the main reason why I belong to the stirring school of thought on paint preparation. If you're a "shaker" and have problems with the lids getting stuck, try stirring instead!
You might be pleasantly surprised!
David Voss will be interested in this: I use the clear plastic greeting card holders as paint stirrers. They look like plastic forks and are available at any florist shop. Snip off and discard the "tines," then cut the card holder into pieces about three inches long or so. (A pair of garden shears does this quickly and easily; wear eye protection.) The long card holders can give you up to six paint stirrers. (A hint: If you cut right, some of the paint stirrers will have a built-in "paddle" that you can use for brand-new bottles or a color that's been sitting around for a long time and needs extra preparation. Use the non-paddled ones for regular paint stirring.) These paint stirrers are wider in diameter than a toothpick. Other choices for paint stirrers: Clean swizzle sticks or chopsticks would also work, as would clean wood barbecue skewers.