Licensed in 1968. Straight key for two years then in 1970 switched to a bug and in 1976 iambic was the new thing to do and used it for the next 37 years.
June 2013 became bored with iambic and went back to a bug. Took about 6 months to become polished. Use it now full time. Occasionally I use iambic when operating slow speed qrp cw since the bug cannot perform at that speed. I like the challenge of a bug. I am an active participant using the bug whereas on iambic it's more of a passive roll.
Someday I may go back to iambic. Who know's. Things change.
Your story is ALMOST exactly like mine, but the dates are different. Licensed in 1978, straight key for 6 months then went to Iambic for next 30+ years.
In 2011 I got bored with iambic and went to a bug (for the first time). I use bugs almost exclusively now. I totally agree with the "active participant" vs. passive role thing (especially if iambic is second nature like breathing to you).
Hope to hear you on the air; I have crystals for 7028, 7050, and 7056!