Effective use of blocks?

Hello; I'm a student using QuartusII in a digital systems lab. In our assignments we were given a tutorial to use blocks to abstract parts of the design. Unfortunately, I find using the method shown to us (http://www.cse.ucsd.edu/classes/sp09/cse140l/lab1/lab1part4.html) to be very frustrating because it entails defining each input and output to the block.

Here's an example:

http://www.cse.ucsd.edu/classes/sp09/cse140L/lab1/adderexample.jpg

For the Binary_display component, we would have to name each wire in and out, know or look up the name of each in/out pin in binary_display.pdf, and map each wire to each pin.

I asked a TA and he agreed that this is the best way to do it, but I wanted to check with this forum just in case there was a faster way to do it. It just seems to me that if this is the best way, it would be incredibly poor design.