You do get used to it, believe it or not. One thing that helped me understand what was going on was looking at the output files, each pulse of the magnet is a s

You do get used to it, believe it or not. One thing that helped me understand what was going on was looking at the output files, each pulse of the magnet is a slice within the images, and each sound corresponds to different types of measurement. I tend to just count them to work out what type of imaging is currently going on, it's ultimately pointless but it's something to focus on given the lack of other stimulus. You'll know you're there when the MRI tech comments that it's obvious you've done a lot of them because every image was perfect.