Third year languages student here, I thought I'd give some input too. I don't pay £9000, 'only' 3000 but choosing Manchester was the best decision I have ever made, I started off firming UEA and I'm SO GLAD I changed it a few days later. I cannot imagine doing my degree anywhere else.
I'm in the French department and they're fabulous, the admin is speedy with responses and I've never been delayed getting coursework grades back. If there is any ever problems or absences we are made aware of them well in advance. We get a good range of modules and the department is close knit so you'll know all your professors and their specialisms.(Even if they don't know you... but this is common in every university no matter what size.)
We have a great Languages lab and library only for languages students, in popular languages like French and spanish there are around 100-150 students in my year, it's a great size because it means you meet all kinda of people whilst not being so big you don't know anyone. I know people on Economics and their course is something like 300 students, my housemate could only name about 5 other people on his course, where as I could easily name a good percentage of mine.
The university is in a fabulous place, admittedly if you went for somewhere like Leeds it wouldn't be too different, but you wouldn't get such a multicultural experience which is so important for languages students if you went to a campus university in the middle of nowhere.
The university has amazing links with other universities abroad all around the world.In my department we could go to France, Quebec,Belgium and even out to islands like Reunion. I know someone doing their year abroad in Togo.
The residence abroad are great and respond to emails quickly and can really help you get your internships and where you want ot be on your year abroad too.
£9000 is a lot of money so obviously you want to choose carefully, but I don't think it would be wasted at Manchester, even if you don't feel like you've seen it all at the end of your degree. It really is all worth it in the end. I'm on my year abroad right now in France and university education costs next to nothing over here and you can really tell and I'm at the Sorbonne which is supposedly one of France's best schools. For example,even in obscure courses there are over 100 students, my seminars never have less than 50 students in and even in core grammar classes and translation classes for learning foreign languages numbers are really high (there are 55 people in my translation class here in Paris,which is crazy as to learn a language you need to be in small groups to get the proper help needed) Despite Manchester's size, that never happened in my first and second years, there were 15-20 max in a seminar and maybe 10 in a grammar class. Honestly it's been a real eye opener for me (thankfully year abroad costs nothing in tuition fees!).
At the end of the day, it's your choice as to where you decide to go and I don't want you to feel pressured in to choosing Manchester, but it does have some good points - it's a shame you felt like you weren't shown these at your open day.