I would guess a lot of this depends on what kind of site/app you are building, and what the value is that it provides to your customers.
I don't know what percentage of people this applies to, but I don't visit websites (or webapps) for their interesting UIs - I visit them for content (in the case of websites), or some concrete value (in the case of apps - Evernote, Google Docs, etc.). In either case, I would prefer the UI do as little as possible. Things like fade-ins, slide-out sidebars and hover-cards are fun to build, but as a user, I would prefer you skip the animation and just show me the content (otherwise it's just increasing the time I have to wait before I can get to the value I'm trying to get to).
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I would guess a lot of this depends on what kind of site/app you are building, and what the value is that it provides to your customers.
I don't know what percentage of people this applies to, but I don't visit websites (or webapps) for their interesting UIs - I visit them for content (in the case of websites), or some concrete value (in the case of apps - Evernote, Google Docs, etc.). In either case, I would prefer the UI do as little as possible. Things like fade-ins, slide-out sidebars and hover-cards are fun to build, but as a user, I would prefer you skip the animation and just show me the content (otherwise it's just increasing the time I have to wait before I can get to the value I'm trying to get to).