We did "Sampson" last season with the Florida Grand Opera with full scenery, costumes and staging. The orchestra was in the pit, as in most operas. You witnessed what we call a "stage" version of the work.
You're right that this opera (some consider it more of an oratorio) is not bursting with memorable tunes, the way Puccini or Verdi do. However, Saint-Saens was a master composer, and there is much wonderful writing in this opera. If you get a chance, get a copy of the score (vocal or full) and a good recording and spend a pleasant afternoon following along. Some libraries in large metro areas have musical scores. They also have CDs and/or DVDs of the major operas. If they don't have scores, you can follow the libretto, usually included with recordings. Before you go to your next opera, put in some time studying the piece, getting yourself familiar with it. Google it and read the background stuff, the composer, etc. Then, when you go to the performance, your enjoyment will be greatly enhanced by your knowledge and you will see and hear things you might have missed. Happy listening!
Best,
Chas Reskin
Editions Bim and The Brass Press, International Music Publishing