Personally, I find that kind of writing outside of fast paced action scenes to be very annoying, it feels as if the writer is insulting my intelligence.
Again, I'm not applying it willy-nilly, but just to my longest sentences (those over 20-30 words), and only then if the sentences can stand alone without losing something. I didn't come to this realization lightly, as I've always written complicated sentences. It's one of my signature styles, but I've learned the story is strengthened by reviewing the sentences and paring a few of them down.
However, like Ross, I question your utter refusal to even consider such a step. You don't need to focus on it as intently as us, but your utter rejection of the concept seems a bit ... absolute. I wonder what you mother did to you as a child to cause such a response now?
As far as slowing down the pace, I typically do that with reflective passages, where the characters reflect on the meaning of events, rather than on recording specific actions and events. Those sections do include much longer sentences, but they also become more difficult to decipher, thus my concern when I encounter them.
However, to balance our argument about this topic, I've whittled down my writing style significantly, discovering I couldn't edit my stories down in size, so I decided to write using fewer words. That's helped my writing style, but readers aren't as happy (my scores have generally been down since I adopted it). I'm addressing it by increasing my chapter sizes and exploring more 'slow, reflective passages', so all too much focus on 'efficiency' isn't ideal. Instead, it's a learning process. You eventually realize you've got to learn a new way to compose sentences, and you go overboard, only to pull back once you realize the effects the changes have. However, I'm still glad I've struggled with it as much as I have, because I'm slowly becoming the author I eventually want to be.