After serving as a police armorer for several years, (30+) I'll give an opinion based on that experience. Those of you who carry firearms for a living, or for personal protection should carefully consider the environment you are going to be working in, (or outside in) and choose your favorite cleaners and lubricants based on this information.
Grease is never a good idea. Ever. Lots of oil, even light gun oil, only serves to attract dirt and dust, and render the firearm unusable or unreliable should it get really cold. Today's firearms, and particularly S&W produced revolvers need very little lubrication anywhere to function properly.
I would suggest looking under the sideplate of an "out of the box" gun (S&W) you have purchased recently for a suggestion on what and how much lubricant is needed in there. You won't find any.....zero. For those of you who carry and expose your carry gun to extreme cold, that is exactly what I would use under the sideplate. Nothing.
Be careful when doing your maintenance and cleaning too. The wrong liquids can get down inside the gun and cause all kinds of issues. I have some horror stories, believe me.
Exterior surfaces and parts of the gun exposed to rain, snow or sweat should be wiped down frequently with a lightly oiled cloth, or even better, with a cloth exposed to a good rust preventative like CorrosionX, Hornady One Shot HD-Extreme, or Frog Lube CLP Paste.
The bottom line is it's your gun, your choice. Choose wisely, and please, do regular practice, maintenance, and function checks.