I have a degree in it.
Whether it improves your thinking or makes it worse is well a philosophical question
In some cases it can make you think about things too much in other cases yes it can offer you insight into the multitude of assumptions we make about the world around us. It can also really **** other people off because it makes it easy to competley undermine other peoples arguments.
It all depends on the university you go to and the modules available so you need to know what interests you.
One thing to note some philosophy is incredibly difficult; think Kant, Hegel and anything to do with Philosophy of Mind is going to make you pull your hair out.
If you want an easier path stick to ethics and the History of Philosphy this will give you a basic grounding from Plato to modern times without necessarily getting into the deep detail.
There is also the question of if you go down the european route (i.e. Phenomonology (European Philosophy), Heiddeger, Sarte, Nietzche (to a certain) etc or go to analytic philosophy(Ryle,Wittgenstein (mostly),Russell, Popper). The european stuff is a little more fluffy with a little more room for interpretation whereas the analytic stuff can be more academically rigourous.
It's all fun though and the best part is all you eed to be able to do is show justified true belief in your essays, i.e. if you can coherently justify your argument you will get good grades. I knew somebody at University who based one of his essays on the pointlessness of writing essays for philosophy degrees and he ended up with a 2:1
ps and I have a decent job too so don't worry about being on the dole with it.