The Louvre, Prado, Uffizi, MET and Rijks, these are all mega-galleries or museums of art that house multitudinous works of art. What these places also house are difficulties for visitors who are interested in having valuable moments with the artworks. Such challenges exist like the mass amount of tourists busying the halls and also the sheer amount of works on display can all take away from the actual experience of the artworks themselves. In the art lexicon this is called art fatigue.
Have you ever felt exhausted or overstimulated from visiting a gallery? Perhaps the problem is you're lacking a structure to your visit. Many curators and art historians are in the school of thought that it is much more beneficial to focus your experience on a minimal amount of artworks rather than trying to see everything all in one visit.
Even though you may have missed "The Birth of Venus", by Botticelli, in the Uffizi, you will find that by focusing your gaze on a select few artworks per gallery room, you will walk away having a much more valued time spent with many more artworks. It is recommended to enter each room with a radar like eye, scanning the gallery room itself, noticing first of all the genre or period of the room. From here you can then make a decision to which three pieces of art you will spend time with in the room. Of course in smaller galleries or small exhibitions, spending time with only three works would not suffice to a meaningful visit, but in mega-galleries like the Louvre that house works spanning multiple centuries, it is beneficial to have a quality over quantity approach.
On my last visit to Galleria Borghese, Rome, I focussed my visit on experiencing the marble sculptures of Bernini. By ignoring three quarters of the artworks in the rooms, I was able to be taken away emotionally by the subliminal beauty of Bernini's works. This visit I will never cease to remember as an incomparable experience.