I enjoy reading for escapism, too, but I have the opposite problem: lazy, badly-written, predictable books make me 'think too much'. I can't get immersed or involved if I'm constantly noticing cliched moments, unconvincing dialogue, and huge plot-holes, or trying to remember where I've heard all this before.
It's like watching a film where the scenery wobbles and the star's obviously wearing Nikes under her Regency gown. If a book's character stares at herself in the mirror, biting her plump lip and lamenting the largeness of her crystal-blue eyes, and never speaks a line of dialogue when she could sigh/shriek/wail/lament/exclaim it, and never does anything without ten adverbs attached, and there's an overwrought line in italics every page to denote her tedious inner monologue, then... where's the escape? This is utterly familiar territory, and not in a good way.
While I'm reading a really excellent book, which may or may not be in the canon or considered a classic, I'm not sitting there analysing it, because the author has been so successful that I'm completely immersed. There were probably at least ten words and references I don't get per page of 'The Line of Beauty', but I loved it anyway because I was (to use a cliche) completely swept along with it. The best writing doesn't exhibit itself for appreciation: it's so good you don't notice the technique, even if you do go back and analyse it afterwards.
You've nailed it.
You've said it exactly how I wanted to say it, but couldn't find the words.