Piano and Trumpet, although I'm way better at Piano, as I've been playing it for 9 years - 2 years more than the Trumpet, and because I had a restrictive couple of years of Trumpet due to braces.
Piano, though, I adore. It gives me so much joy to be able to play some of the beautiful music written for the instrument.
In fact, I'm the opposite to you OP, as my love for the piano has been waxing, rather than waning, over the past couple of years. I changed teacher a couple years back, and I got massively into Chopin from learning his Nocturne in F-Minor, Op. 55 - to the extent that I now have the majority of the pieces he ever wrote on my iPod, often with multiple recordings of each piece. What I love about Chopin is that in nearly every piece there is at least one moment of breath-taking sublimity, which often literally makes me stop what I'm doing through sheer ecstatic catharsis. On top of this, with Chopin you feel that it's never difficult for the sake of being difficult - or for the sake of showing off - like with, for example, Liszt (not to say that I dislike Liszt), but because it's exactly how he felt the piece should sound. That and his obsessive perfectionism is probably what led to him being famously quoted as one of the three composers who never wrote a bad piece, along with Beethoven and Bach; a statement that I whole-heartedly endorse.
Ugh, sorry, I apologise for the massive fanboy rant.
Anyway, I'm currently learning a movement of his first Piano Concerto (The 'easy' one, Mvt. 2, in my opinion one of the most incredibly written and...well, I've run out of synonyms for beautiful, but I was gonna end with 'ever'), which I hope to play in January.
Wish me luck guys...