Not at all, you can still make switches. The only thing that stands in your way is the limitations of the switches and how they can only do so much. You can still switch, but coding in rgss really helps if your game is different than your average rpg. RMXP is built for battles like in final fantasy mystic quest, not Final Fantasy 7. But if you get in there with a big ol pointy keeboard and really screw up the code, you could have a new breakthrough in the way your game works. The reason why I don't use rm2k3 is because my crappy computer won't respond to any font fixes, so I'm forced to use rmxp, but there are better graphics and the ability to send your finished, or demo version, of your file across the web without anyone having to download rmxp. one of the reasons it costs money, but apparently better versions of the game go for around the time to download(time is money to some people...I have no Idea how, pm if you know how I can get money out of my time.) so overall... Use whatever you feel like, experiment, ask questions, and if you still don't get it... Ask Blue cube. Most people don't like rmxp, and I don't blame them, but who cares? as long as the game that comes out of it is fun and enjoyable...oops off topic.
so yes you can do switches in any one of those nifty programs. It's just a matter of how strong you want them to be. I have a feeling I misinterpretted your phrase switching of maps. I thought you meant swapping, not the actual switches which go on, off, and have cost me many switchy minutes.