Typically speaking, there are often very specialized tools for very specialized jobs. It only makes sense that there would be software specifically created for use in electrical documentation and design then.
If you are not using actual Electrical Cad Software to work out your electrical plans, then you are making more work for you and your electrical department than necessary. While it is possible to use other programs and processes for your drafting purposes, it is not always efficient to do so. This is only going to slow the process down and increase your own costs. On the other hand, the proper Cad program will provide you with just the right set of features and abilities to get the job done right.