We see people raised from the dead through Peter and Paul. We see amazing things happening in the first-century church through the power that Christ gave to His apostles. Some say that perhaps we can't do greater works than Jesus individually but that corporately we are able to exceed in power the things that Jesus did. There's nobody who comes close to the work that Jesus did. I can't think of any more serious delusion than that, that somebody would actually think they have exceeded Jesus in terms of the works He has done. There are many today who believe that there are people running around this world right now who are performing greater miracles, performing miracles in greater abundance, and actually doing more incredible acts of divine healing than Jesus Himself did.
Let me tell you what I don't think it means.
He is speaking to the first-century church, and He makes the statement that the works they do will be greater than the works that He performed (John 14:12). First of all, He said that to His disciples and only to us indirectly, if at all.