I don't like Massenet either
Massenet can be pretty good (though he is very uneven). Of his better known works Werther is probably the best... he was better when tied to a recognizable European world than exotic or fantasy settings....
I'm also partial to Therese (a short work, not long enough for a full evening's program).
An interesting example of a famous Polish work that is very unknown in modern Poland might be 'modlitwa dziewicy' (Maiden's Prayer) by Tekla Bądarzewska-Baranowska
It remains very popular with Asian pianists and also has an important place in the history of western swing (and north Mexican music).
en.wikipedia.org/wiki/Maiden%27s_Prayer
piano:
youtube.com/watch?v=dTww0x2dHt0
western swing:
youtube.com/watch?v=NKqt1lxAs4o&list=RDNKqt1lxAs4o&start_radio=1
there used to be a mexican version on youtube but I can't find it now...