More and more this is being taken on a case by case basis. As more phone systems have their plugs on the front of the system, patch panels may become the best option for your company. This setup displayed to the right has the voice cabling on the patch panel and the voice cabling on the four "66 blocks" on the wall. This is also a good solution, even if your phone system has plugs on the front. Again, this is a case by case basis so have this discussion with your installer.
Now, there will always be exceptions to terminating all the data cabling to a patch panel. When you are in a smaller office with less than 10 computers sometimes it is more cost effective and cleaner to just have plugs put at the ends of the data cabling that plugs right into your switch or router. However, there are some larger companies that need to have their cabling terminated to patch panels so for ease of troubleshooting and administration.
In theory it is a very good idea to have all the voice and the data cabling terminated to a patch panel. It helps with the adds and changes that every company makes and can (I use that word very cautiously) save money for the company. However, it can also end up looking like a complete nightmare if not properly executed. You can see some examples of these nightmares by clicking here.
If you truly do want to go with the patch panel solution the best plan is to purchase a rack that will house all the patch panels and cable management. This solution will allow you to have the ease of management that you are aiming for while still keeping things looking neat and professional. If you neglect to get a rack your cabling will get ugly real fast and your ease of administration that you thought you had will get ugly really fast. Here is an example of a customer site we took over where the previous vendor did a very bad job of cable management. After we pulled out all the old cabling and installed new cabling, here is a picture of our finished work (I apologize for the picture quality).