Why? In some cases it is not clear if the signals are connected or if wires are just crossing. Also, it can cause problems when manipulating with wires (e.g. moving or copying them).
Altium has a lot of free templates for different form factors. For example, if you need to design a PCIE card, you don’t have to create it from scratch. You can download it and it will save you a lot of time. Here is the link to the Altium design content website: http://designcontent.live.altium.com/