I did a lot of bulk loading when I was still using 35mm camera's, and it sure saved me a lot of money. There is one risk though in that dust particles get stuck in the felt lips of the cassette and can leave you with a nice scratch on all of the 36 hard won images of your film. You have to throw the cassettes away at a certain point, but you can never know when that moment arrives. It can help when you blow them out before loading with compressed air when they are open.
Today bulk loaders can be had practically for free from people who switch to digital (I got one with the film still in it), so the initial cost is coming down too.
As to the point that bulk loading makes it easy to switch film by loading short lengths: I feel that it is more convenient to buy a used (also very inexpensive nowadays) spare body and load that with the other ISO film. In that way, you will have a backup too.
Hans