Yeah, I'm in that boat. I am an ex-Xbox fan, PS-only owner since 2010. I occasionally get tempted (almost) to buy an Xbox as a second console. From my point of view, Xbox always had a few interesting exclusives, but they were too slowly dribbled out and never quite enough to justify my purchase. I'm basically a one-console guy anyhow.
Originally, I thought that all their acquisitions meant that I would eventually have to relent and buy an Xbox, in order to play some game now exclusive to Xbox. Funnily enough, it worked exactly the other way around. The financial weight of those acquisitions seems to have persuaded them to send their exclusives to PS - obviating my need to buy an Xbox. Thanks, Phil!
I prefer to have everything on one console if possible. I'm sure many other people feel the same.