The display burned out on my S4 so I can't access or install smart switch. Are my contacts and pictures lost?
Hello. Welcome to Android Central.
Not necessarily. Pictures could be accessed with a computer IF you had no pin/password /pattern screen lock, just swipe to unlock. They may have been synced to your Google account, the sync photos option is left on in Accounts - Google, how many depends on how often you turn master sync on.
They would also save to Google+ if you have a social profile there.
Google / Gmail would have your Google Contacts, Samsung would have your Samsung contacts, Device Contacts would only sync with Kies on a pc.
If you cannot remember how to log in to Google on a pc you can get help there.