It's easy to confound "anti-attitude" with "anti-performance", but I think that is a mistake. Cycling is fun in part because of its speed. Otherwise, we could be walking. That doesn't mean that we should prioritize speed over everything else – comfort and fun are more important. But when the gains come without penalties, such as wide supple tires – faster, more comfortable and more puncture-resistant – or frames that get in sync with your pedal strokes ("planing") – lighter, more fun at any power output – then it makes sense to embrace them.
I agree with Jan, but also with Mark -- but then, I see no real conflict, just 2 different populations. Me, I am a recovering compulsive time trialer who used to turn every commute into a record effort, and as I got older -- into my mid 50s -- that became less and less fun. So, over the last 5-7 years I've gradually learned to take it easier (I removed all the computers), and I enjoy riding more.
But, I still like to ride "energetically", still time myself, and especially -- and this is a key point, I think -- I enjoy the feel of a bike optimized, at least to a degree, for efficiency and speed. After all, one of the great pleasures of cycling is, to use my brother's phrase, the sensation of efficient motion.
I think that even casual riders will get more pleasure from a relatively efficient bike than from one that, say, is needlessly heavy or that has wooden tires.
"I would imagine no suspension will speed the climb."