What do you mean by graduate applications are worst things you have encountered?
Well there are many reasons.
Many you manually type out everything (IE. Transcripts, resume). Hours and hours of repetitive applications, so you've got to keep track of everything. Most also will send you an email for creating a HR account, an email for commencing an application and another when you submit.
Most, if not all, will give you several of those online tests to do. Even 10 companies sending you testing that take an hour each is obviously, more of your time. You also can't get results for many, and some companies will send results to other companies you apply for within a year of taking the test (So if you get nervous and do bad, you can't really redeem yourself). Most have moved into "game" style tests, and almost all give you more questions than you can answer in the given time!
Video interviews are the spawn of Satan.
Assesment centres. If you get to this stage, your often given one date and time (probably one that clashes with class or work). I've also noticed many companies never have enough time slots or their booking system doesn't work properly which is fun. Many are also last minute invitations, so be prepared to drop everything!
Some application processes open in February/March and drag out until August. So it's a long process of uncertainty.
And last but not least, as with all job applications, if you actually hear back in a reasonable time frame, your doing well. I've seen plenty of people get rejected or never hear back for no apparent reason. It's nothing personal, but there's just that many applicants your up against.
As you can see, I'm really cynical and over all this right now