yes and sometimes even ideas.
whenever i see opera the moment of the highest emotion is always different for me and it depends on how the opera is built. in lucia di lammermoor in the totally horrifying moment when she has cracked, i realised how all the other parts of the opera had added up to form that moment and i was watching every nuance breathlessly and couldn't look away. part of it in la traviata, apart from the tragedy of the love story, was the physically demanding nature of the performance and how by the time violetta's dying at the end i kept thinking about how exhausted the soprano must be and how her voice just kept going and going. by the end of fidelio i had this overwhelming sense that the opera was saying "this is an opera about justice. yeah that's right, justice. isn't that enough of a theme for you?"
someone told me that opera is a perfect composite art form consisting in elements of dance, music, theatre, and visual effects. sometimes it's just that: the sheer overwhelming artistic value, the athleticism of the artists on the stage, the spectacle of it, the orchestra, the libretto...