If you're just not that into Photos for Mac yet, you can still send some of your Mac's photos to your iPhone or iPad using iCloud's older image-sharing features. It also happens to be my favorite hack for getting images from the now-discontinued iPhoto or Aperture onto your iOS devices.
- Launch Settings on your iPhone or iPad.
- Tap Photos and Camera.
- Make sure iCloud Photo Library and iCloud Photo Sharing are enabled.
- On your Mac, open iPhoto or Aperture.
- Click the pictures you want to upload.
- Click Add To > iCloud or Share > iCloud with your picture selected to create a new Shared Photo Stream.
Name your stream something like "iPhoto Images" and share it with your own Apple ID; within minutes, it should start to populate on your iOS devices under the Shared tab in the Photos app.