My initial enthusiasm for the workshop has definitely come to an end. I climbed the wall of having to earn 500,000 trade credits to upgrade my main's workshop from level 2 to level 3, just to find that the next upgrade required me to do the same thing again, only this time for 5 million credits. Also, where a big part of my initial push had been made possible by the conversion of old crafting materials to new (via a horrible vendor interface that makes you want to bash your head against the wall), I was fresh out of tradable materials by that point. The cherry on top was the realisation that instead of earning 5 million trade credits, you can just pay 5 million AD for the upgrade instead. Neverwinter has a lot of pay-to-win aspects, but they aren't always this blatant.
It also hasn't helped that without consulting any kind of guide, I went about my business very inefficiently initially. Having opened a workshop on my first alt, I'm now trying not to commit the same mistakes again, but just the thought of having to go through the whole unlocking and upgrading process on seven more characters is somewhat deflating.
It might not be so bad if you're a new player and learning things as you go, but as a more casual player who previously maxed out her professions over several years of casual play, having to start over at this point and being faced with this much grind just leaves a bitter taste in my mouth.