Cisco puts out a good line of Managed switches, routers/PIX firewalls, etc. They're one of the first leading WAN companies. They originally only made Routers, then they started buying up switch manufacturers to jump into that business.
You don't need cisco to run a company though. You can get a checkpoint firewall which is like working on a linksys router.. it's all webbased, you don't need to know syntax to make things work. That's why Checkpoint has become so popular. It's about as good as the cisco stuff though.
As far as VPN, I don't really know any other company to not use a Cisco VPN solution.
A managed switch is good.. but cisco has their own syntax for everything and requires someone to know cisco.. and fairly well to be able to do things. While other companies, mainly Checkpoint, are making GUI based network equipment so a company doesn't need a cisco person around.
Now, Cisco equipment is high end.. you get very skilled people, the equipment doesn't wear out or get too outdated.. it's good stuff without a doubt.
I figure, if you're going to hack a Cisco router, you're going to need to know the syntax.. on a checkpoint, you just need a password and then you're into the GUI.. Cisco just adds a layer of complexity.