As a radiology grad (in fellowship for a year), I don't regret going into radiology. I am quite happy with my role as consultant and feel that I do help patients a great deal, even if the majority of the time its indirectly. I like the variety of radiology (from the brain US on a neonate to the knee MRI on a 20 y/o to the chest CT on a 80 year old, we do it all). I also like the fact that I can do procedures (not just in interventional, general rads do biopsies, fluid drainages, etc). The satisfaction you get from radiology is much different than in other fields, and it can take a while to get used to that.
Do I occasionally think it would be nice to have some more direct patient contact? Very occasionally, I do feel it would be nice to be a "real doctor" as my clinical friends like to refer to it. It usually passes very quickly.
Are there annoying things? Certainly there are, as there are in every field. I don't like some of the uncertainty that comes with imaging. Radiologists don't like finding those incidental possible lesions any more than clinicians do. I also don't like not giving people a good answer to the clinical question. There is a lot that radiology can help diagnose. However, there are inherent limitations to imaging diagnosis that can be frustrating. While the majority of my interactions with clinicians is stimulating and satisfying, there are those who are demanding and condescending to my field. There are those that don't understand imaging and its limitations. Then there are those who feel they know imaging better than you. Interactions with those few clinicians can definitely ruin my morning. Luckily, its few and far between (and much more common in academia, where the egos are huge, than in the private practice world).
As for the future of radiology, I'm fairly certain the current high reimbursement will go down in the near future. I don't think it will go down enough to bother me greatly, but its something to think about when choosing the field. I will be making a great living no matter what. The current market will likely not last more than 5-10 years. I don't think finding a position will be a concern as it was in the early 90s, but the options will be a little less. The shortage of rads has abated somewhat, but is still present and will likely remain so for quite a while, in my opinion.