Yes. This is one of the annoying things with PDFs. Luckily, many PDF-viewers, like Foxit Reader 3.0 allows block-selection of any text so you can copy and paste the text from that into the Inkscape svg.
There may be some other solutions available in Inkscape that I'm unaware of.
Regs, Jimmy
I have imported a PDF with a electronic schematic and have found that
text are kept together all over the drawing and not just over
linebreaks.