It really depends on what your reading and what your professors demand of you. It can be easy if your scope in your papers is small and isn't too complicated (which is what is best to do for phil classes), but this doesn't mean it is anything compelling.
I am currently working on a term paper about Kant's formulation of humanity and I have spent countless hours reading and thinking. This is because I am planning to use it as a writing sample for grad schools, so I am putting more time into it. The point is writing a paper with an argument is one thing, but making it air tight is another.
This isn't to disrespect you or what you studied, but you should be aware (you might be, I really don't know) of the levels one can get into with philosophy. Taking a course of Hegel's Phenomenology of Spirit and really having a grasp on the content isn't the same as a course on ethics where you briefly cover the vast amount of common problems.
While I don't know all that much about comp sci and programing, I believe the symbolic logic courses one is generally required to take as a phil major are similar. Just this part of philosophy can become extremely complicated.
edit: look at this
http://plato.stanford.edu/entries/logic-linear/
The hardest part of philosophy is probably the volume of knowledge of the tradition one is required to know. To understand Derrida or Foucault, you really need to know your Kant and Hegel. While some people can pick up something by Foucault and grasp it to some degree, the difference with someone who is serious about philosophy is that they can articulate and defend the ideas in relation to movements such as structuralism, post structuralism, enlightenment, or the modern era in general. Knowing what is going on in a work of philosophy is different than just being able to briefly restate the general thesis.