I was using Android File Transfer to transfer music from my Mac to my phone and now it just won't work when I plug in my phone. What does everyone use?
I uploaded all my music to the cloud using Google Music (could take a few days depending on how much music you have. Its best to start it and then not touch it until its finished). I can then stream music or decide to save it to my phone through the app. Also I signed up for the free month of All Access and haven't cancelled it since because I love it so much. Oh also Chromecast and Sonos support make this any easy choice for me.
I use iSyncr and it is actually easier than iTunes, IMO. It can sync wirelessly at a set time each day. You can choose the playlists and songs. It is 2 way sync and can also sync photos if you choose. I have been using it for several years now and it works great.