There are things you can measure but not feel, and things you can feel but not measure (in the sense of the measurement resolution of performance parameters). If you're riding for sensation, do things which feel better. If you're racing, do things which make you faster.
Neko Mullaly (sp?) made an interesting comment on one of his recent videos.
He had been testing components for weight- had even taped bottles of water to the frame to move the centre of gravity around.
Said (of the components) he couldn’t feel the lighter weight, but he could feel the drop in performance of the lighter parts.