I think that you're thinking of the Modern English of Shakespeare's era or Middle English (e.g. 'Whan that Aprill, with his shoures soote'), not Old English (e.g. 'Hwæt we Gar-dena in geardagum, þeodcyninga, þrym gefrunon').
Middle English is very similar to Modern English, and can be read with relative ease. Old English has to be studied as a foreign language.