i definately think that you can be desensitized to this type of stuff. After awhile it is either expected of you or it will be taken for granted. Both of which defeat the purpose. My Bf surprises me with flowers for no reason like every 3-4 months, along with buying them for real reasons.... birthdays, v-day, etc. I really wouldn't recommend doing it like every two weeks. honestly, it makes it less special. Also even though i think it's cool to try to switch up the kind of surprises you have for her, whether it be flowers, balloon, a card....... the fact is that if you do it all the time it will all ultimately have the same effect. Space it out. put a few months in between. switching what you do each time.

anyways, chances are eventually you will run out of ideas. try doing what i do. when you get a really good idea, write it down. save them. don't just use it because it's there. just don't keep doing what ur doing. it sounds like overkill..... atleast i think ur friend is right