Hi Qster5,
Welcome to the Apple Support Communities!
I understand that you no longer see the option to sync playlists in iTunes after joining Apple Music. This is because, with Apple Music, all of your playlists are already available on your iPhone.
First in the Music application, select My Music in the bottom right and then choose Playlists at the top of the window.
Next, select All Playlists in the middle of the screen, shown in-between Edit and New in the attached image (page 74 from attached User Guide). Make sure the selection for Show Music Available Offline is turned off. If it is turned off, you will be able to see all of the playlists from iTunes on your computer in this section.
If you would like to make these playlists available for offline listening, please follow the steps outlined below from the attached User Guide, page 71.
Add Apple Music. To add music, tap (the 3 dots) next to any result, then tap Add to My Music. To stream an added song to iPhone, tap it within My Music. To save music to iPhone so that you can play it when you don’t have a Wi-Fi or cellular connection, tap Make Available Offline.
Best regards