In UofG Architecture comprises 20 out of 120 credits in 1st, 2nd (and 5th year if you are doing MEng), this goes up to 30 in 3rd and 4th year. A lot of people go into it not knowing what it is exactly and the number of people on the course from 1st to 2nd year has halved in the past. It is purely tutorial based where, you have a day in GSA working on a given brief supervised, you then go away and finish the work at home and come back the next week with an iteration of the finished product. You may pin the work up and have a discussion with the class about what is good and what isn't and then you're off again, doing another iteration at home and so on until the final week of said project. You then have reviews twice a year where you pin up all your work and get feedback on it.
These 20/30 credits are a VASTLY different experience to studying Engineering or any Science based degree for that matter. Doing well pretty much solely relies on you showing up, doing your best and taking on board criticisms of your (and everybody else's) work every week and making the appropriate adjustments. There isn't a myriad of textbooks and video tutorials for how to do something like you would have for the rest of your subjects, as it is not formulaic in any way and the constraints of "right" and "wrong" only apply to Architectural norms and functionality of things like how thick a wall is or how large a room should be (which are things you pick up along the way and I personally haven't yet been explicitly taught). Everything else is down to your imagination. It teaches you to be able to stand up for your design as you will have to explain your design decisions and definitely helps with public speaking and taking constructive criticism on the nose.
You miss out on environmental modules in 3rd and 4th year which narrows your playing field slightly when you graduate but if you're dead set on Structural Engineering then it may well be the best course for you. It is by absolutely no means a way of getting into Architecture, it is simply giving the civil engineer an insight into the way architects design which makes for a more cohesive team when working on projects in industry, and an appreciation for design in cases where the job doesn't involve an architect.
I recommend getting in touch with the university you're wanting to apply to and asking to speak to a student on the course over email as they'd be able to explain everything to you first hand.