I know there are plenty of grants out there but there must be an easier way than filling out form after form online?
No. There are no such a services in covering this task. Even if there any, I will not use it since applying for a scholarship require high motivation for a specific position which will not be achieved by automatic filling things. Also, if there any, I will consider them as a harmful service because the experienced professor can differentiate between spam application and real application and this will lead to direct rejection.
I'm afraid the answer is: There is no free lunch.