That's also my story. I spent countless hours reverse engineering software but stopped after going Linux-only. In fact I realized that reverse engineering was the only reason I'd been using Windows for a very long time.
I also remember many wonderful tools like PEiD (locating and identifying hash functions), hiew (hexeditor), RSATool (RSA cracking tool), FSG (file compressor). There was also OllyDbg and it seems that it's still actively developed.
Ah, memories.