if it was "quite mild" you took way too little. most blotters now are really weak. remember that the tablets and microdots from the late 60's.early 70's were 200-400 mcg. blotter now is like 20-80 mcg per square. that's pretty common though now, people take a low dose and don't have a real trip.
you should have something happen that's along the lines of dying and being reborn, having an out of body experience, merging with the entire universe, timelessness, loss of self awareness etc. on a proper dose. some real crazy shit can happen at higher doeses and it can last for a real long time.
obviously taking acid a lot isn't a good idea. if i had any tendency toward psychosis, bipolar disorder or just flipping out in general, i would avoid it. but if you're a mentally sound individual who enjoys intense experiences, it can be worth while to try it.
i honestly had a worse panic attack from weed than any experince ive had from more powerfull hallucinogens. that doens't mean acid is safer than weed of course, it isn't.