Lorcan Nagle said:
Microsoft Visio is another option that's possibly more accessible than CC - it's included in many MS Office distributions.
Having used Visio as well as CC3, Smart Draw, and several other vector based drawing programs, be aware that all of them have a learning curve of some sort.
The big difference is where the learning curve is - CC3's is up front, but once you get past that, there is a lot of "advanced" stuff that can be done quite easily. Visio's, Smart Draw's and others are quicker to get to using, but doing the more advanced stuff can be extremely difficult, if not down right impossible until you learn the secret tricks to doing that kind of stuff in those programs.
Availability of gaming specific symbols and images are another reason to consider mapping programs designed for RPGs and gamers - programs like Dunjinni and CC3 have far larger variety of genre specific symbols available free, or at lower cost than programs like Visio & Smart Draw.
I'm not saying don't use Visio, I'm merely pointing out that sometimes it seems easy to dismiss more specialized solutions based on incomplete knowledge. If you happen to have an MS Office installation that includes Visio, definitely give it a try - for basic stuff it can work quite well, and besides, if you have it already, then you've paid for it. But don't go out and buy it strictly for mapping without considering the other options first.