You might think that a springform pan falls into this category, but I use mine all of the time and find it to be very important in my kitchen arsenal. It just does things that no other pan can do!
For starters, it lets you make really good cheesecake – like my lemon cheesecake with blueberries. Can you make this cake without a springform pan? I guess so, but it won’t be as good and you’ll have a heck of a time getting it out of a normal pan.