Warming up the car by driving it will be quicker than warming up by idle. Taking it easy at the start is the key. I don't think we live in a cold enough climate to be warming up our cars. Even so, modern cars shouldn't need to be IMO. You'll save time and money.

Not telling you to start the car and drag race off, now that will wreck havoc to your internals. Otherwise I think it's fine. Of course that's just my opinion and only that. I'm sure there are some useful articles online that may shed some light on this matter.

Back to the oil topic. Our manuals recommend 5w-30 but that's pretty thin for an engine that's done over 200k. I personally would go 40 as I've always done, even on my Accord that's done over 250k.