How has your AI workflow changed over the past year?

I’m interested in hearing from people who’ve used multiple LLMs (ChatGPT, Gemini, Claude, Grok, DeepSeek, etc.) extensively over the past few months.

I’m less interested in benchmark scores and more interested in real-world experience. Which models do you trust most for reasoning, coding, writing, research, or brainstorming? What strengths and weaknesses only became obvious after long-term use? Have your preferences changed over time, and if so, why?