I recommend negotiating from a position of power whenever possible (in this case, a BATNA) [1]. If you're interviewing when you want, while you're employed, it's on your terms. Don't like how the interview is going? "This isn't a good fit, have a great day" and move on to the next opportunity. It's only an interrogation if you let it be. Don't let it be.

I do agree with you that money and opportunities can be had without perpetual interviewing. The goal is to increase the number of dice rolls to maximize your chances of success. If you can do so without interviewing constantly, absolutely! Do it! But if you're comfortable constantly exploring work opportunities, and you have the time, I recommend doing so.

[1] https://www.pon.harvard.edu/daily/negotiation-skills-daily/e... ("Your best alternative to a negotiated agreement, or BATNA, is often your best source of bargaining power. By cultivating a strong outside alternative, you gain the power you need to walk away from an unappealing deal.")

(While we're here, here are two great resources on salary negotiations as well [2] [3])

[2] http://www.kalzumeus.com/2012/01/23/salary-negotiation/ (patio11 on salary negotiation)

[3] https://news.ycombinator.com/submitted?id=JoshDoody (Josh Doody, whom I have no affiliation with, has tons of quality material on negotiating roles and comp in general)