Skramble - that sounds bad Brownies can be so much more fun, and educational, than that. It's great that you are getting involved and want to change it
We have a similar structure for each meeting, and we also plan the term in advance (in a couple of hours over pizza, wine and chocolate ) so there is a structure to the term as well. This ensures that we have a good balance of games, crafts, Brownie work and other projects.
Our 90 min meetings run roughly as follows:
Brownies arrive and sit in their sixes, getting on with six things (they each have a board which they can put pictures on, have an attendance register for their six etc.)
When they have all arrived, we have about 15 mins of register and news plus brief discussion of what we are going to do for the evening. That can vary though - we had a 40 min chat (and lots of cooing) on Monday when I took my 6mo DS in for show and tell
We then do about an hour of activities.
We usually do a quick game if we have time and then the final 5 mins is getting into a circle, sing Brownie bells, handing out letters etc.
For say a 10 week term, we might do 1 night on the Adventure/Adventure On stuff near the start of term then tailor some of our activities over the term to meet those objectives. We probably do 1 night of games, 2 nights of crafts or cooking, 1 night at our local guide centre doing outdoor stuff (e.g. campfire and songs), 2 nights on an interest badge that the whole unit does (something like Brownie Traditions or First Aid which they couldn't do so easily on their own) and 2 nights on some other challenge then an end of term party.
Challenges are a great way or organising different, interesting activities for the girls. They can also get badges for these which they love. Somebody mentioned Right Here, Right Now which we have done, and we are now doing Changing the World, having picked a local hospice as our charity.
One thing that we think is great is doing challenges from other guiding regions. These are special badges/challenges set up by a county/region but they will usually let you do them wherever you are in the country. They are great for activities for the girls - in the last year we have done an Africa Challenge, an India Challenge, a Muddy Boots challenge and an Olympics challenge. The girls love these, and they love the badges, and we love them because the challenges come with ready made activities so we don't even have to think and can get 2-3 nights worth of activities out of them. Info on these local challenges usually filters down through County/Division/District communications so it pays to be on as many email lists and receive as many meeting minutes as possible!
For discipline we have a points system - Brownies get points for helping out without being asked, for shutting up promptly when we want to speak, for doing interest badges, for wearing all of their uniform, for having trainers on and hair tied back etc. They can lose points for not doing any of those too. We're tough on them I guess that sounds old school, but actually I'm the oldest (yet most junior!) guider at 32! We find that this sort of discipline really works. The six with the most points at the end of term wins a prize - usually some chocolates and Brownie pencils or socks or mug. They love it!