You can still go to Picasa Web Albums, but you have to bookmark the old URL or manually type it in the address bar. Google+ Photos lacks many of the features from Picasa Web Albums: Picnik integration, batch editing, entering an album description, ordering prints, creating album maps, moving photos to a different album and more. The interface is more user friendly, but it's not yet a full-fledged photo sharing app.
{ Thanks, Herin. }