You need to answer all those questions just to get a quote but sadly it's the only way to get a one. But don't under-insure as that will give you real problems if you do need to make a claim. Just look at the optional extras and see if you really need all of them.
At the end of the day you can only save money by getting other quotes and if they are cheaper for the same level of cover, use it as a way of getting your current insurer to match the price.

It's a lot of hassle but that's what they rely on - people sticking with them because they can't be asked to look around for a better deal. Add to that the best deals are aimed at new customers and it seems really unfair. If you can pay in one lump sum (I did with my house and contents) it's cheaper and sometimes companies allow you to pay quarterly (I do this with my car ins) which is also cheaper, as it's monthly payments that attract a premium - not much use if you can only pay monthly though.

Jan