I understand tachanun isn’t particularly “fun” to say and so it’s a relief for many when we’re exempt from saying it. Nonetheless, when a person is truly broken both in body and spirit, and he says “V’yomer David el Gad, ‘Tzar li me’od'” and then pauses and thinks to himself – I’m not just describing how David hamelech felt, but how I myself feel this very moment (ie tzar li me’od). There’s an incredible opportunity for growth, reflection, and as we approach the end of tachanun, solace and hope.
The Anshe Knesset HaGadol and Chazal instituted tefillah in this particular seder and manner because it is applicable to our own lives. Our role is pour our hearts out to HaKadosh Baruch Hu in pure tefillah in the way in which it was instituted. If we spend just a few minutes each day reflecting on the meaning of the words in our tefillahs, imagine how much we will gain.