Most of the time in enterprise sales, the potential customer is too busy to try software himself. Learning a new piece of software takes a lot of time and effort.
Unless you are a techie, it's easier to just have salespeople do the work of walking you through quick demos. Or have someone junior at your own company, take care of the "dirty work" of figuring out new software and tell you the results. It sounds like you are that junior person at your company :)