If a glider shows up somewhere by accident, like in an an otherwise random-looking arrangement of floor or wall tiles in a bathroom or somewhere, then I'll certainly pick it out immediately (and be unwarrantedly cheerful for the next half hour or so). But that doesn't happen all that often.
It seems like I rarely have dreams about Life patterns, though it does happen. Maybe some people with better-resolution imaginations might have a different experience, but Life patterns need a lot of precision and focus, and in my dreams everything is always fluid and shifting and I can never find my car keys or my homework, let alone any interesting Life configurations.