I used Parnet with the a Win98 machine but it was very slow. I then fitted SCSI to the Amiga and put a ZIP drive in the Win98 machine. Two minute job really. 100MB ZIP disks go a very long way to storing stuff and I configured the Amiga to read PC formatted disks and even use them like a hard drive. The next step was to use a CD writer on the PC and start copying stuff to CD and having a CD and ZIP drive on the Amiga. Finally I added ethernet to the Amiga and configured a series of PCs and the Amigas all on a network. That was the best thing to do to be honest. Took me a while with OS3 and Samba but works a treat. Personally I found Parnet very usable but only to transfer stuff like when I had a bit of time on my hands.
I have icons on my PC and Amiga for all my computers and the open the folders on each. Windows98 and Windows95 works best. The XP is a pig at the best of times but thats another story. My Amiga 1200 uses broadband on the internet so you can even file transfer across the net though I wouldn't take 98 or 95 on the web now. Its all just an internal network. Personally I wouldn't be without SCSI on the Amiga.