I don’t have any of the VMware products installed on my PC, but I have some VMDK virtual machine disks which I run inside VirtualBox.I had trouble installing some update on one of my virtual machines because I did not have enough space. I needed to make it larger, but I was not able to find some easy solution without having to install VMware Server or similar robust not free software.
I used to copy virtual disks using CloneVDI tool and I realized that it is possible to resize the virtual machine disk during cloning. This tool is very simple to use and does not require to be installed.
You can download it from VirtualBox forums or you can download it from my site mirror.