I appreciate your ability to see things in black and white, but the problem for the current day GOP, not the days of yore, is that all of the rational ones are being purged out of the party. About 15 years ago a guy like Bill Weld, my former governor, could speak at the GOP convention. Forget about a speaking slot at the convention nowadays, you can't even find a sitting GOP governor with his moderate credentials anymore. Like him they've been kicked out of the GOP. So yes, current Republicans are by and large nutjobs as the reasonable ones either run for the exits (Snowe) or are shown the door (Lugar).
To that end, there would be no need for Romney to govern by executive order because The Boner and Itch will be doing the governing for him. He would be the weakest GOP President since Ford, and weakest of any since Carter. He would spend the first four years signing any legislation that came before him in a bid to avoid a crippling primary from the right (think DeMint or something). This would include unconstitutional measures such as allowing pharmacists to deny birth control for example, re-litigating gay rights issues, and fresh detainees sent to Gitmo, all of which would end up before the SCOTUS. So yes, he would have the same so-called disdain, just without the justification of a Congress openly trying to stop anything from getting done.